SIGINT Activity Designators (SIGADs)

(Updated: January 19, 2015)

A SIGINT Activity Designator (or SIGAD) is a alphanumeric designator which identifies a facility that is used for collecting Signals Intelligence (SIGINT). These facilities have many different forms, ranging from satellite intercept stations, spy ships and satellites, to sites where internet cables are tapped.

SIGADs are used for intercept facilities operated by the signals intelligence agencies of the United States, the United Kingdom, Canada, Australia and New Zealand, as these five countries have a close relationship for collecting and sharing signals intelligence under the so-called UKUSA-agreement.

Since World War II several thousand SIGADs have been assigned. A screenshot of the NSA's BOUNDLESSINFORMANT tool showed that in March 2013 there were 504 active SIGADs, which means that in that month NSA collected data from 504 intercept facilities. This number probably includes many subsets and maybe a several dozen are really significant sources.

Screenshot of the BOUNDLESSINFORMANT tool showing how many
data are collected worldwide through 504 SIGADs

A typical SIGAD looks like USN-855

The first two letters indicate the country and can be US for the United States, UK for the United Kingdom, CA for Canada, AU for Australia and NZ for New Zealand.

Then comes one letter indicating what sort of staff runs the station, which can be M for Army, N for Navy, A for Air Force, J for Joint services (mainly military), F for Joint services (mainly civilian), D for Detachment or C for Civilian staff.

After a hyphen follows a unique number which identifies the particular facility.

An additional alphabetic character is added to denote a sub-designator for a subset of the primary collection unit, like a detachment. Lastly, a numeric character can be added to provide for a sub-sub-designator. When a particular SIGAD has one or more sub-designators these are indicated by an asterisk (*).

An example of a SIGAD with a sub-sub-designator is US-987LA

Down below is a list of all known SIGADs from past and present and from all five UKUSA-countries. Sorting the unique numbers in groups of hundreds, revealed that they are apparently assigned according to this scheme:

1 - 89: US Army, Navy, Air Force
90 - 99: Canada
100 - 199: United Kingdom
200 - 299: United Kingdom
300 - 399: Australia and New Zealand
400 - 499: US Navy
500 - 599: US Air Force
600 - 699: US Army
700 - 799: US Joint services
800 - 899: Various US services
900 - 999: NSA
1000 - 1999: NSA
2000 - 2999: ?
3100 - 3199: NSA
3200 - 3299: NSA
3300 - 3399: NSA
3400 - 3499: NSA

Presently, only a few SIGADs from the 1000-range and none from the 2000-range are known. Maybe these are used for new intercept facilities of US military services and for SIGINT units deployed in the Afghanistan and Iraq wars, like the large number from the 600-range used for intercept sites during the Vietnam war.

Some SIGADs seem to be highly classified and may not be mentioned in documents accessible to all Five Eyes-partners.

Some documents leaked by Edward Snowden show that there are also communications collected by facilities under a designation starting with DS, but for reasons yet unknown these doesn't fit the regular SIGAD-scheme:

DS-200: "NSA's reporting of GCHQ's Special Source collection"
DS-200A: ?
DS-200X: ?
DS-202A: ?
DS-204A: ?
DS-800: ?

A declassified NSA training program storyboard from 2011 says that domestic internet (PR/TT) and telephony (BR) metadata collected under FISA authority have SIGADs that begin with a specific character, which is stil classified. This could explain why some SIGADs are blacked out, even in some of the Snowden-documents.

Slide showing the number of ownerless e-mail address books blocked,
by points of access, designated by SIGADs from all five
UKUSA countries (listed at the right side)

United States

US Army facilities
Intercept facilities operated by the United States Army are designated by SIGADs beginning with USM:

USM-1: Vint Hill Farms Station (1942-1997)
USM-2: ASA post at Two Rock Ranch in Petaluma, California (1942-1971)
USM-5: Former SIGINT site at Helemano, Hawaii (closed in 1958)
USM-5: Facility in Berlin (1975-1992)
USM-6: Facility in Herzogenaurach, Germany (1947-1960)
USM-7: Former SIGINT site at Fairbanks, Alaska (closed in 1953)
USM-7: 7th RRFS, Ramasun Station, Udon Thani Province, Thailand
USM-8: Facility in Scheyem, Germany (1951-1957)
USM-9: 9th RRFS, Philippines
USM-9K: Tan Son Nhut AFB

USM-35: 60th Signal Service Company
USM-42: Facility in Bamberg, Germany (1956-1957)
USM-42K: Facility in Bamberg, Germany (1954-1966)
USM-43K: Det. K of the 17th (...) at Wobeck, Germany (1966-1970)
USM-43K1: Facility in Altefeld, Germany (1956-1957)
USM-43K1: Facility in Bad Aibling, Germany (1957)
USM-44: European Security Operations Center in Augsburg, Germany (1972-1993)
USM-44F: Sub-facility in Bad Aibling, Germany
USM-44K: Sub-facility in Wobeck, Germany (1970-1975)
USM-45: Facility in Baumholder, Germany (1952-1960)
USM-76: Panama (with a detachment on Beacon Hill)
USM-82: 507th USASA in Baumholder, Germany (1964-1967)
USM-85: Facility in Bad Aibling, Germany (1956-1963)
USM-87: Facility in Bad Aibling, Germany (1956-1972)
USM-88X: Facility in Waldsassen, Germany (1956)
USM-89: 18th USASA in Bad Aibling, Germany (1956-1972)

USM-600: Facility in Augsburg, Germany (1968)
USM-601: Facility in Augsburg, Germany (1968)
USM-602: Facility in Augsburg, Germany (1957-1968)
USM-604: 330th RRC, Pleiku, South Vietnam (1969-1975)
USM-605: Facility in Bad Aibling, Germany (1957)
USM-605: Camp Eagle, South Vietnam (1969-1975)
USM-607: Can Tho, South Vietnam (1969-1975)
USM-609: Facility in Augsburg, Germany (1970-1976)
USM-613: 313th ASA BN, Nha Tranh, South Vietnam (1969-1975)
USM-614: 303rd ASA BN, Bien Hoa, South Vietnam (1969-1975)
USM-616: Xuan Loc, South Vietnam (1969-1975)
USM-616: Direct Support Unit (DSU) in Augsburg, Germany
USM-620: 54th USASA in West-Berlin (1951-1974)
USM-620K: UHF intercept site in West-Berlin
USM-620K: Facility in Bahrdorf, Germany (1957/1965)
USM-620Y: 78th USASA at Berlin Tempelhof (1957/1965-?)
USM-624: Long Thanh, South Vietnam (1969-1975)
USM-625: Former SIGINT site at Helemano, Hawaii (closed in 1967)
USM-626: 3rd RRU, 82nd SOU, Bien Hoa, South Vietnam (1969-1975)
USM-626: Intercept site in Ansbach, Germany
USM-626*: Sub-facilities in Ansbach, Germany
USM-626J: Phu Bai, South Vietnam (1969-1975)
USM-628: Bien Roa, South Vietnam (1969-1975)
USM-628: Direct Support Unit (DSU) in Augsburg, Germany (1975-1976)
USM-631: Phouc Vinh, South Vietnam (1969-1975)
USM-633: 372nd Radio Research Company at Cu Chi, South Vietnam (1969-1975)
USM-633J: A detachment of the 372d Radio Research Company
USM-634: Pleiku, South Vietnam (1969-1975)
USM-636: Di An, South Vietnam (1969-1975)
USM-636: Former SIGINT site at Helemano, Hawaii (closed in 1976)
USM-638: Cam Ranh Bay, South Vietnam (1969-1975)
USM-644: Facility in Augsburg, Germany (1975-1976)
USM-645: Quang Tri, South Vietnam (1969-1975)
USM-649: Chu Lai, South Vietnam (1969-1975)
USM-653: Nha Trang, South Vietnam (1969-1975)
USM-662: Direct Support Unit (DSU) in Augsburg, Germany (1970-1976)
USM-662*: Sub-facilities in Augsburg, Germany

USM-704: 509th ASA Group, Saigon, South Vietnam (1969-1975)
USM-794: Saigon, South Vietnam (1969-1975)

USM-808: 8th RRU, 8th RRFS, Phu Bai, South Vietnam (1969-1975)
USM-818: ?

US Navy facilities
Intercept facilities operated by the United States Navy are designated by SIGADs beginning with USN:

USN-13: Former SIGINT site at Adak, Alaska (closed in 1996)
USN-18: Dupont, SC (as of 1945)
USN-18: Panama (as of 1976)
USN-22: Facility in Augsburg, Germany (1973-1994)
USN-27: Naval Communication Station at San Miguel, Philippines
USN-27J: Phu Bai, South Vietnam, later USN-842
USN-39: Misawa, Japan

USN-414: 1st Radio Batallion, Danang, South Vietnam (1969-1975)
USN-414T: Pleiku, Phu Bai, South Vietnam (1969-1975)
USN-467: Naval Direct Support Unit (DSU) missions:
USN-467N: USS Maddox patrol involved with the Gulf of Tonkin incident (1964)
USN-467Y: USS Pueblo, captured by North Korea in 1968

USN-842: Phu Bai, South Vietnam (1969-1975)
USN-843: Danang, South Vietnam (1969-1975)
USN-855: USS Liberty (1964-1968)

US Air Force facilities
Intercept facilities operated by the United States Air Force are designated by SIGADs beginning with USA:

USA-29: 7th RRFS, Udorn Royal Thai Air Force Base, Udorn, Thailand
USA-31: Listening post at Osan, Korea
USA-32: 2nd detachment, 6925 Security Wing, Danang, South Vietnam (1969-1975)
USA-34: 3rd radio Squadron Mobile at Elmendorf AFB, Alaska
USA-36: ? (existed as of 1967)
USA-38: 6920th Electronic Security Group at Misawa AFB, Japan
USA-50: 6950th Security Group at Chicksands, England
USA-52L: Facility in Zweibrucken, Germany (1954-1959)
USA-53: 6913th Radio Squadron in Bremerhaven, West Germany (1951-1968)
USA-53: Facility in Augsburg, Germany (1976-1991)
USA-57: 6922nd Security Wing, 6925 Security Squadron, Clark AFB, Philippines
USA-67: Facility in Augsburg, Germany (1976-1991)
USA-70: 6912 Security Squadron at Tempelhof or Marienfelde, West-Berlin (1954-1967)
USA-70K: 6912 Security Squadron at Berlin Tempelhof (until 1967)
USA-70K: 6912 Security Squadron at Berlin Teufelsberg (1970-1976)
USA-70L: 6912 Security Squadron in Wobeck, Germany (1970-1976)
USA-73: Former VHF intercept site in Hof, West Germany

USA-514: Former site in Germany (1957-1958)
USA-516: Former SIGINT site at Eielson AFB, Alaska (closed in 1973)
USA-522J: Cam Ranh Bay, South Vietnam (1969-1975)
USA-561: Tan Son Nhuh, South Vietnam (1969-1975)
USA-562: Phu Cat, South Vietnam (1969-1975)
USA-563: Danan, South Vietnam (1969-1975)

(these US Air Force SIGADs should not be confused with the designations for US military satellites, which have the same format and are listed here)

US joint facilities
Intercept facilities operated by joint US military services are designated by SIGADs beginning with USJ (mainly military staff) and USF (mainly civilian staff):

USF-63: NSA listening station at Rosman, North Carolina (1981-1995)

USJ-750*: NSA Hawaii
USJ-751: Non-corporate interception facility
USJ-753*: European Cryptologic Center (Germany)
USJ-755: Utah Regional Operations Center
USJ-759: Menwith Hill Station (MHS) - LATTICE
USJ-759A: Menwith Hill Station (MHS) - STARQUAKE
USF-778: NSA listening station in Bad Aibling, Germany (1967-2004)
USJ-783*: NSA Texas
USF-787: YRS
USF-799: Misawa Air Force Base in Japan
USJ-799: Non-corporate interception facility
USJ-800*: NSA Georgia

Other US facilities
Some other SIGADs begin with USD, where D stands for detachment, like for example NSA representatives and their offices at sites of foreign partner agencies:

USD-110: NSA listening station at Yakima, Washington, US

USD-1000: NSA representative at Menwith Hill Station, UK
USD-1001: ?
USD-1001TEC: Technical Exploitation Center at Misawa AFB(?)
USD-1005: Combined Group Germany (CGG) office in Munich, Germany
USD-1005A: CGGA in Augsburg, Germany
USD-1020: NSA representative Europe in Stuttgart Vaihingen, Germany
USD-1021: NSA representative in Frankfurt/Main, Germany (since 1975)
USD-1023: NSA/CSS Augsburg, Germany
USD-1024: NSA representative in Berlin, Germany (since 1975)
USD-1025: Special US Liaison Officer (SUSLO) at GCHQ in Cheltenham, UK
USD-1031: GCUG at Rheindahlen, Germany
USD-1079: Special US Liaison Activity Germany (SUSLAG) in Bad Aibling

US space platforms
US Air Force space platforms are designated by SIGADs beginning with AFP. For reasons unknown, both these letters and the unique numbers don't fit in the main scheme for the other SIGADs.
This has been clarified by a reader, pointing to an article which explains that the AFP-numbers were actually used for a wide variety of space programs and therefore not as a SIGAD.

NSA facilities
Intercept facilities operated by the NSA are designated by SIGADs beginning with US without an additional letter:

US-916A: Collection of telephone metadata by a Polish agency

US-96*: Sites of the NSA/CIA Special Collection Service (SCS)
US-962A5: SCS collection of telephone metadata from Afghanistan
US-966A: SCS collection site
US-966L: SCS collection site
US-966V: SCS collection site(s)
US-968U: SCS collection site
US-968Z: SCS collection site

US-97*: Sites of the NSA/CIA Special Collection Service (SCS)
US-972U: SCS collection site

US-982: TRANQUIL (phone and internet cable intercept facility, until 2010)

US-983: STORMBREW under Transit Authority (a corporate partner for transit switch access with 27 opc/dpc pairs)

US-984: BLARNEY under FISA authority
US-984J: FBI data under FISA authority
US-984P: STORMBREW under FISA authority
US-984T: FAIRVIEW under FISA authority
US-984X*: BLARNEY facilities under FAA authority:
US-984XA-H: STORMBREW facilities under FAA authority
US-984XN: PRISM program collection under FAA authority
US-984XR: FAIRVIEW collection under FAA authority
US-984X2: FAIRVIEW collection under FAA authority

US-985D: Collection of telephone metadata by a French agency
US-985HA: 3rd party collection from ?
US-985Y: Collection of telephone metadata by the Dutch agency MIVD

US-987: 3rd party collection sites?
US-987A3005: Collection of mobile phone metadata by an Italian agency
US-987F: Collection of mobile phone metadata by a Norwegian agency
US-987L*: West-German 3rd Party collection sites:
US-987L1*: German collection site
US-987L2*: German collection site
US-987L3*: German collection site
US-987L4*: German collection site
US-987L5: German collection site
US-987LA: Listening post of the German BND in Bad Aibling, Germany
US-987LB: Listening post of the German BND in Afghanistan
US-987S: Collection of mobile phone metadata by a Spanish agency

US-990: FAIRVIEW under Transit Authority (corporate partner for transit switch access with 860 opc/dpc pairs)

US-3101C: ?
US-3101M: ?
US-3105: ?
US-3105S1: DARKTHUNDER (SSO corporate/TAO shaping program)
US-3105S1: STEELFLAUTA (SSO corporate/TAO shaping program)
US-3111C: ?

US-3127: AZUREPHOENIX (phone (671 opc/dpc pairs) and internet cable intercept)

US-3136**: Close Access collection under the GENIE program within the US:
US-3136BR: Against the Brazilian embassy using LIFESAVER techniques
US-3136HN: Against the Brazilian UN mission using VAGRANT techniques
US-3136IJ: Against the Brazilian UN mission using LIFESAVER techniques
US-3136LO: Against the French embassy through the PBX
US-3136MV: Against the Italian embassy using HIGHLANDS techniques
US-3136OF: Against the French UN mission using HIGHLANDS techniques
US-3136PD: Against unknown targets in New York using COOP techniques
US-3136SI: Against the Brazilian embassy using HIGHLANDS techniques
US-3136SU: Against the Italian embassy using LIFESAVER techniques
US-3136UC: Against the French embassy using HIGHLANDS techniques
US-3136VC: Against the French UN mission using VAGRANT techniques
US-3136VQ: Against the Brazilian UN mission using HIGHLANDS techniques
US-3137**: Close Access collection under the GENIE program outside the US
US-3138: STARRUBY (trashint)

US-3145: MOONLIGHTPATH (phone (381 opc/dpc pairs) and internet cable intercept)

US-3150: ?
US-3153: FALCONSTRIKE (phone and internet cable intercept)

US-3167: SARATOGA (non-corporate facility with 1313 opc/dpc pairs))

US-3170: SSO facility for collecting content under the STELLARWIND program
US-3171: DANCINGOASIS (non-corporate intercept facility)
US-3178: DULCIMER (phone and internet cable intercept)

US-3180: SPINNERET (phone (2022 opc/dpc pairs) and internet cable intercept)

US-3190: FIREBIRD (phone (136 opc/dpc pairs) and internet cable intercept)

US-3206: MONKEYROCKET (foreign access point)
US-3217: SHIFTINGSHADOW (foreign access point)
US-3219: NSA/CIA Special Collection Service site
US-3230: ORANGECRUSH (foreign access point)
US-3237: SMOKYSINK (phone (1816 opc/dpc pairs) and internet cable intercept)
US-3247: YACHTSHOP (internet metadata collection)
US-3251: ORANGEBLOSSOM (international transit switch collection)
US-3261: Telephone intercept facility with 5 opc/dpc pairs
US-3270DA: DUSKPALLET (interception of Kenyan GSM networks)
US-3273: SILVERZEPHYR (international transit switch collection under Transit and FAA Authority with 91 opc/dpc pairs)
US-3293: Telephony intercept facility with 20 opc/dpc pairs
US-3294: Intercept facility targeting traffic from Peru

US-3300: Telephony intercept facility with 39 opc/dpc pairs
US-3310*: (MYSTIC?)
US-3310A: BASECOAT (interception of GSM networks at the Bahamas)
US-3310A1: BASECOAT site
US-3310A2: BASECOAT site
US-3310**: SOMALGET sites
US-3310BG: SCALAWAG (non-corporate intercept facility)
US-3311: Telephony intercept facility with 1 opc/dpc pair

US-3411A: EVENINGSEASEL (interception of Mexican wireless)

One of the doors to room 641A in the building of AT&T in San Francisco,
where the NSA had a secret internet tapping device installed,
reportedly under the BLARNEY program (SIGAD: US-984)


Intercept facilities in Canada are designated by SIGADs beginning with CA. Initially the third letter showed what sort of staff operated the station, but after the Armed Forces Unification in 1968 the third letter became an F for all military facilities:

CAF-90: Gander (1942-present)
CAF-91: Masset (1944-1945 and 1949-present)
CAN-92: Aklavik (1949-1961)
CAF-92: Inuvik (1961-1986)
CAM-93: Ladner (1949-1971)
CAN-94: Chimo, later Frobisher Bay (1953-1967)
CAA-95: Whitehorse (1948-1968)
CAN-96: Coverdale (1942-1971)
CAN-97: Gloucester (1943-1972)
CAF-98: Leitrim (1942-present)
CAC-98CG: Sub-facility of Leitrim (maybe CANDLEGLOW?)
CAN-99: Churchill (1948-1968)
CAF-99: Probably the fleet Cryptologic Direct Support Elements (CDSE)

The Leitrim listening station (SIGAD: CAF-98) in Canada

United Kingdom

Intercept facilities in the United Kingdom are designated by SIGADs beginning with UK. The third letter can be M for Army, N for Navy, A for Air Force, J for Joint services or C for Civilian staff:

Civilian facilities

UKC-102: Intercept station in Singapore
UKC-125: ?

UKC-201: Intercept station at Little Sai Wan, Hong Kong
UKC-206D: ?
UKC-215: British facility that contributes second most to NSA, location unknown

UKC-302A: British facility that contributes most to NSA, location unknown
UKC-309: "Exchange" facility in Germany

UKC-1000: Telex interception site at 8 Palmer Street, London

Army facilities

UKM-251: British Army facility in Birgelen, Germany
UKM-251H: (former?) intercept site at Gross Gusborn, Germany
UKM-251M: ?
UKM_251Y: (former?) intercept site near Jever, Germany
UKM-253: (former?) intercept site near Hildesheim, Germany
UKM-253: British Army SIGINT unit in Cyprus
UKM-253A: (former?) facility near Langleben, Germany
UKM-253B: (former?) facility near Wesendorf, Germany
UKM-257: Interception station at Ayios Nikolaos, Cyprus

Navy facilities

UKN-125: Royal Navy station at Scarborough near Scotland

Air Force facilities

UKA-277: Former RAF intercept site at the Teufelsberg, West-Berlin (closed in 1992)
UKA-277B: Former RAF intercept unit at the Teufelsberg, West-Berlin
UKA-277F: Intercept site at the former Royal Air Force Station Gatow, Berlin

UKA-289: (former?) facility near Wesendorf, Germany

Joint services facilities

UKF-100: Radio Intercept Station at Knockholt, Kent (1941-?)

UKJ-260D: ?

The GCHQ intercept station Ayios Nikolaos (SIGAD: UKM-257) in Cyprus


Intercept facilities in Australia are designated by SIGADs beginning with AU. Presently, only the SIGADS of two civilian operated sites are known:

AUC-393: ?
AUC-395: ?

The intercept station near Geraldton (SIGAD: ?) in Australia
(source: Echelon Mobile User Objective System)

New Zealand

Intercept facilities in New Zealand are designated by SIGADs beginning with NZ. As all sites are operated by civilians, the third letter is a C:

NZC-331: Former Nr.1 listening station (1949-1982)
NZC-332: Radio intercept station at Tangimoana (1982-present)
NZC-333: Satellite intercept station at Waihopai (1989-present)
NZC-334: GCSB mobile station
NZC-335: GCSB mobile station

The listening station at Waihopai (SIGAD: NZC-333) in New Zealand
after activists deflated one of the kevlar radomes in April 2008
(photo: Derek Flynn/Marlborough Expres)

- Wikipedia article about the SIGINT Activity Designator
- List of SIGADs for facilities in Germany (pdf)
- Nicky Hager, Secret Power, New Zealand’s role in the international spy network (pdf), 1996, p. 149
- Maybe You Had to Be There, in: Cryptologic Quarterly (pdf), p. 21, 23 and 36
- Surveillance satellites: Jonathan's Space Report No. 509
- Canadian Station Designators


Anonymous said...

Missing one USF-63 Rosman, NC.

P/K said...

Thank you, it's added to the list!

Bill Robinson said...

Thanks for this post. One possible correction: as I wrote here (, "the suggestion that the AFP numbers associated with some U.S. military space programs are the SIGADs for those systems is, I believe, not correct. As Dwayne A. Day explains here (, AFP numbers were used for a wide variety of space programs, including SIGINT satellites, but also including communications satellites, meteorological satellites, R&D satellites, IR/early warning satellites, and photo reconnaissance satellites. Furthermore, unlike SIGADs, AFP numbers were used for public references to those various programs."

P/K said...

Thank you for the correction! I didn't know the article explaining the satellite designations, but it clearly makes sense, as the AFP-numbers also didn't fit the SIGAD-scheme. I will correct the article.

Rob1 said...

Impressive job ! Here are some you can add to your list :

USN-18: Dupont, SC (as of 1945)
USN-18: Panama (as of 1976)
USA-36: unknown (existed as of 1967)
USM-76: Panama (with a detachment on Beacon Hill)

(numbers found in Tom Johnson's American Cryptology during the Cold War, volumes )

USA-50: 6950th Security Group at Chicksands, UK
USD-1025: "GCHQ Cheltenham" ("USD" means probably the SUSLO - Senior US Liaison Officer)

From Duncan Campbell, "The Eavesdroppers", Timeout, 1976

USM-818: related to CTF-76 ? see

P/K said...

Many thanks for the additions, I will add them to the listing!

Rob1 said...

Again another one :

USM-2: ASA post at Two Rock Ranch in Petaluma, California (1942-1971).

(also from American Cryptology during the Cold War. I hope we'll get soon more declassified versions of volumes I and IV.)

P/K said...

Thanks again - this is clearly the correct facility, instead of the US embassy in Moscow, as supposed by another source.

Anonymous said...


Bill Robinson said...

Some more SIGAD descriptions:

"International Transit Switch Collection*: International Transit switches, FAIRVIEW (US-990), STORMBREW (US-983), ORANGEBLOSSOM (US-3251), and SILVERZEPHYR (US-3273), are Special Source Operations (SSO) programs authorized to collect cable transit traffic passing through U.S. gateways with both ends of the communication being foreign."


Bill Robinson said...

More on SILVERZEPHYR here:

Lawrence Surtees said...

I believe we can identify seven cable intercept sub-SIGADS for US-983: STORMBREW, which we know to be under Transit Authority (corporate partners for transit switch access with 27 opc/dpc pairs.
Another Snowden document identified seven sites associated with STORMBREW all code named after ski resorts: BRECKENRIDGE in Hillsboro,OR; COPPER MOUNTAIN in New York City; KILLINGTON in Lynn, MA; MAVERICK in Miami;
SUNVALLEY in Morro Bay, CA;
TAHOE at Point Arena, CA; and WHISTLER in San Antonio.
From various cable almanacs and carrier websites I believe BRECKENRIDGE is the Verizon TPE Hillsboro Cable Landing Station; COPPER MOUNTAIN is at the Verizon hub on Hudson St.; KILLINGTON is the Hibernia Networks cable landing in Lynn; MAVERICK is the Verizon-Terremark NAP of the Americas; SUNVALLEY is the major Pacific cable landings for AT&T, NTT & KDDI; TAHOE is the AT&T Manchester Cable station; and WHISTLER is likely the AT&T POP switch at 815 Avenue B.

P/K said...

Thank you - that's an interesting addition!