Autonomous system detail  ·  US flag US

AS102

Announced

Operated by U.S. National Science Foundation, US flag US.

Summary

// analyst note
A legacy government ASN that is genuinely live; analysts will see a small, stable U.S. federal-agency network, not a hosting or transit provider. RegDate 1987-03-31 (Confirmed ARIN).
// security note
NEUTRAL/DATED: no notable public abuse signal found as of 2026-06-09; clean government network.
IPv4 prefixes
3
~66.0K addresses
IPv6 prefixes
3
announced
Peer networks
1
1 up · 0 down
IANA block
1-1876
Assigned by ARIN
[ 01 ] — Context

About this ASN.

Updated  ·  Confidence: High  ·  3 sources  ·  How this page is checked

AS102 is a legacy spring-1987 allocation registered under ARIN to the U.S. National Science Foundation (OrgName "National Science Foundation," OrgId NSF-14, Alexandria, VA), carrying the handle "NSF-HQ-AS." The NSF is the federal agency that funded NSFNET — generally accepted as the progenitor of the modern Internet, whose backbone was decommissioned April 30, 1995, giving way to the commercial internet — so this number carries real internet-history weight. Today it is a genuinely live but small federal-agency network: as of June 2026 it originates 3 IPv4 prefixes (128.150.0.0/16, 192.12.209.0/24, 198.181.231.0/24) and 1 IPv6 prefix (2620:10f:6000::/40), described by bgp.tools as a small government network peering with one other network and one upstream carrier (AS6223, Lumen/CenturyLink). The ARIN RDAP RegDate is 1987-03-31 (autnum last updated 2017-12-15; org record refreshed 2025). For triage, analysts will see a small, stable U.S. federal-agency network — not a hosting or transit provider. No notable public abuse signal was found as of June 2026.

Operator
U.S. National Science Foundation (ARIN OrgId NSF-14, Alexandria, VA) [Confirmed] — ARIN RDAP
Country / RIR
US, ARIN [Confirmed]
Allocated
ARIN RDAP RegDate 1987-03-31 (autnum updated 2017-12-15; org refreshed 2025) [Confirmed]
Org status
active

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-09; clean government network — bgp.tools

Network & routing

Network type
government (US federal agency) [Confirmed]
Size
3 IPv4 prefixes (128.150.0.0/16, 192.12.209.0/24, 198.181.231.0/24; ~66,044 addrs) + 1 IPv6 (2620:10f:6000::/40) — bgp.tools / IPinfo (2026-06)
Routing/peering
active; "small government network" with 1 peer and 1 upstream (AS6223 Lumen/CenturyLink); RPKI unknown — bgp.tools
Notable usage
[historical] NSF funded NSFNET, progenitor of the modern Internet (backbone decommissioned 1995-04-30). [current] carries NSF's own agency/enterprise network from Alexandria, VA — nsf.gov
Related ASNs
none specifically confirmed for this profile
Analyst note
A legacy government ASN that is genuinely live; analysts will see a small, stable U.S. federal-agency network, not a hosting or transit provider.
[ 02 ] — Announced prefixes

What this network routes.

6 prefixes total · as observed by RouteViews at 2026-09-20 · one collector view, not a global census
// IPv4 prefixes3
  1. 128.150.0.0/16/16
  2. 192.12.209.0/24/24
  3. 198.181.231.0/24/24
// IPv6 prefixes3
  1. 2620:10f:6000::/40/40
  2. 2001:428:2500:1c::/64/64
  3. 2001:428:9002:f806::/64/64
[ 03 ] — Notable peers & upstreams

Who it talks to.

1 observed neighbour
// Notable connections1 of 1 observed

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.

ASNOperatorRole
AS6223 — upstream
Neighbours observed via public BGP collectors; not a complete peering list.