AS101

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.