USAS101
Operated by University of Washington, US.
Summary
- // analyst note
- A live, well-connected R&E network with a clean academic profile; the rare case where the historical association and current registry holder match exactly. Cross-link UW's AS73 (main campus) and AS14221.
- // security note
- NEUTRAL/DATED: no notable public abuse signal found as of 2026-06-09; prefixes RPKI-valid.
About this ASN.
AS101 is a legacy allocation registered under ARIN to the University of Washington (OrgId UWND-Z, Seattle, WA), carrying the handle "WASH-NSF-AS" — a name reflecting its NSFNET-era regional-networking role. This is the rare case where folklore and current holder match: the historical UW-area academic association is confirmed by the registry. The ARIN ASN RegDate is 1987-03-31 (updated 2021-10-01). Today the ASN anchors Pacific Wave and Pacific Northwest Gigapop infrastructure (the RADB aut-num carries as-name PNW-GIGAPOP, "Pacific/Northwest Gigapop"): it originates 4 IPv4 and 4 IPv6 prefixes — Pacific Wave (207.231.240.0/20, 2001:504:b::/48) and PNW Gigapop space (209.124.176.0/20 and /21s; 2001:1860::/32 and /34s) — all RPKI-valid. It is well-connected: bgp.tools (June 2026) lists 107 peers, 2 upstreams, and 17 downstreams (cone 47), while bgp.he.net observes 89 BGP peers; imports include NTT (AS2914), Cogent (AS174), Lumen/Level 3 (AS3356), and Internet2 I2PX (AS11164). UW also operates AS73 (WASHINGTON-AS, the main campus AS, done earlier in this sweep) and AS14221. For triage this is a live, well-connected R&E network with a clean academic profile. No notable public abuse signal was found as of June 2026.
- Operator
- University of Washington (ARIN OrgId UWND-Z, Seattle, WA) [Confirmed] — ARIN RDAP
- Country / RIR
- US, ARIN [Confirmed]
- Allocated
- ARIN ASN RegDate 1987-03-31 (updated 2021-10-01) [Confirmed]
- Org status
- active
Security/abuse context (NEUTRAL, DATED)
no notable public abuse signal found as of 2026-06-09; prefixes RPKI-valid — bgp.tools
Network & routing
- Network type
- research / education (regional R&E / gigapop) [Confirmed]
- Size
- 4 IPv4 + 4 IPv6 prefixes — Pacific Wave (207.231.240.0/20, 2001:504:b::/48) + PNW Gigapop (209.124.176.0/20 and /21s; 2001:1860::/32 and /34s) — bgp.tools (2026-06)
- Routing/peering
- very well-connected — 107 peers / 2 upstreams / 17 downstreams (cone 47) per bgp.tools; 89 observed peers per bgp.he.net; imports AS2914, AS174, AS3356, Internet2 I2PX AS11164 (RADB as-name PNW-GIGAPOP); RPKI all valid — bgp.tools / RADB
- Notable usage
- [historical] "WASH-NSF-AS" reflects the NSFNET-era regional-networking role. [current] anchors Pacific Wave / Pacific Northwest Gigapop R&E infrastructure for UW and the Pacific Northwest — uw.edu / pnwgp.net
- Related ASNs
- AS73 (WASHINGTON-AS — UW main campus, done in Batch 016), AS14221 (UW-GR-AS) [Confirmed]
- Analyst note
- A live, well-connected R&E network with a clean academic profile; the rare case where the historical association and current registry holder match exactly.
What this network routes.
- 207.231.240.0/20
- 209.124.176.0/20
- 209.124.176.0/21
- 209.124.184.0/21
- 198.32.195.0/24
- 2001:1860::/32
- 2001:1860:4000::/34
- 2001:1860:8000::/34
- 2001:1860:c000::/34
- 2001:504:b::/48
Who it talks to.
Neighbours observed by RouteViews at 2026-09-20, lowest ASN first. Relationships are inferences from the CAIDA AS Relationships Dataset, 2026-08-01, and establish no commercial arrangement; a dash means the inference did not resolve.
| ASN | Operator | Role |
|---|---|---|
| AS174 | Cogent Communications, LLC | upstream |
| AS3356 | Level 3 Parent, LLC (Lumen Technologies) | upstream |
| AS7575 | — | upstream |
| AS11164 | — | upstream |
| AS11537 | — | upstream |
| AS73 | University of Washington | downstream |
| AS293 | Energy Sciences Network (ESnet) | peer |
| AS2152 | — | peer |
| AS2153 | — | peer |
| AS2497 | — | peer |
| AS2907 | — | — |
| AS3130 | — | peer |
| AS3428 | — | downstream |
| AS3491 | PCCW Global (HK) Limited | peer |
| AS3807 | — | downstream |
| AS4193 | — | downstream |
| AS6939 | Hurricane Electric LLC | peer |
| AS7774 | — | downstream |
| AS10430 | — | downstream |
| AS11548 | — | downstream |
| AS11649 | — | downstream |
| AS11956 | — | downstream |
| AS13476 | — | downstream |
| AS14221 | — | downstream |
| AS14954 | — | downstream |
| AS17200 | — | downstream |
| AS19014 | — | downstream |
| AS40272 | — | downstream |
| AS53472 | — | downstream |
| AS54429 | — | downstream |
| AS58511 | — | peer |
| AS59105 | — | peer |