AS257

AS257 is a legacy autonomous system number registered under ARIN to the Navy Network Information Center (NNIC), the U.S. Navy's IP-registry and network-information body. Its ARIN registrant handle is NNICN-1, listed at 2465 Guadalcanal Road, Building 1265, Virginia Beach, VA 23459, with administrative, technical, and abuse functions handled by DISA-Columbus (Defense Information Systems Agency) at 300 North James Road, Whitehall, OH 43213 and the abuse address disa.columbus.ns.mbx.arin-registrations@mail.mil. The autnum top-level registration event dates the ASN to 1988-12-22, with a last-changed event of 2011-07-05. Operationally AS257 is a small government stub network: RIPEstat and CAIDA agree it announces two IPv4 /24s (204.102.229.0/24 and 205.155.65.0/24, 512 addresses total) and one IPv6 /48 (2607:f380:804::/48), all routed exclusively through CENIC / CalREN (AS2152, with AS2153 also CENIC-affiliated). The 204.102.229.0/24 block is associated with the Naval Postgraduate School in Monterey, CA, consistent with the CAIDA centroid near coastal California. CAIDA records a rank of 44,553, clique membership true, a customer cone of 1 ASN / 6 prefixes / 960 addresses, AS-degree 2 (two providers, zero peers, zero customers), and RIS visibility is effectively complete (327/327 IPv4 peers, 323/324 IPv6). RPKI posture could not be assessed from the supplied data (no prefix was passed to the validation endpoint). No notable public abuse signal was found as of June 2026 across Spamhaus ASN-DROP, AbuseIPDB, CleanTalk, and NANOG archives — a sourced null consistent with a small, well-run DoD-operated network.

Operator

Navy Network Information Center (NNIC), U.S. Navy / DoD (ARIN registrant handle NNICN-1) [Confirmed] — ARIN RDAP autnum/257, whois.arin.net/rest/asn/AS257

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin), CAIDA AS Rank

Allocated

1988-12-22 (ARIN autnum top-level registration event); last changed 2011-07-05 [Confirmed] — ARIN RDAP autnum/257 top-level events

Org status

active U.S. federal government entity — Navy network-information / IP-registry body, administered under DISA-Columbus; ARIN org NNICN-1 (registered 2006-09-21, last changed 2025-03-13). Related command context: Naval Network Warfare Command (NAVNETWARCOM) [Confirmed for ARIN org; Likely for command context] — ARIN RDAP entity/NNICN-1, en.wikipedia.org/wiki/Naval_Network_Warfare_Command

Contacts

abuse/admin/tech via DISA-Columbus — disa.columbus.ns.mbx.arin-registrations@mail.mil, +1-844-347-2457 ext2, 300 North James Road, Whitehall, OH 43213; registrant address 2465 Guadalcanal Road, Bldg 1265, Virginia Beach, VA 23459 [Confirmed] — ARIN RDAP autnum/257, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-20 — not in Spamhaus ASN-DROP, AbuseIPDB, CleanTalk, or NANOG archives; sourced null across multiple independent feeds for a DoD-operated network

Network & routing

Network type

U.S. Federal Government / military — Navy network operations infrastructure, administratively managed under DISA-Columbus [Confirmed] — ARIN RDAP autnum/257, ipinfo.io/AS257

Size

small/stub — 2 IPv4 /24 prefixes (512 addresses) + 1 IPv6 /48; customer cone = 1 ASN, 6 prefixes, 960 addresses [Confirmed] — RIPEstat routing-status, CAIDA AS Rank

Routing/peering

announced and fully visible (327/327 v4, 323/324 v6 RIS peers); CAIDA degree total 2 (provider 2, peer 0, customer 0); sole upstream AS2152 (CENIC / CalREN), AS2153 also CENIC-affiliated [Confirmed] — RIPEstat routing-status, bgp.tools/as/257, bgp.he.net/AS257, ipinfo.io/AS257. No PeeringDB entry and no public peering policy document found; policy presumed selective/restricted

[Likely] — bgp.tools/as/257

RPKI

not assessable from supplied data — RIPEstat rpki-validation was skipped (no prefix supplied) [Unknown] — RIPEstat rpki-validation (skipped)

Notable usage

supports the Naval Postgraduate School (Monterey, CA) network via 204.102.229.0/24; transit exclusively through CENIC / CalREN. bgp.he.net notes an IRR parent origin mismatch on the IPv6 prefix [Confirmed for NPS/transit; Likely for the IRR mismatch] — ipinfo.io/AS257, networksdb.io/.../navy-network-information-center-nnic, bgp.tools/as/257, bgp.he.net/AS257

Announced prefixes

204.102.229.0/24, 205.155.65.0/24, 2607:f380:804::/48 (stable across the 2026-06-06 → 2026-06-20 observation window) [Confirmed] — RIPEstat announced-prefixes

Analyst note

small DoD/Navy stub ASN with a clean public record; allocation date taken from the autnum top-level registration event (1988-12-22), NOT the nested NNICN-1 entity date (2006-09-21, a decoy).