AS525

AS525 is a legacy autonomous system number registered under ARIN to Headquarters, USAISC — the United States Army Information Systems Command — with the RDAP handle CTNOSC-525-AS, pointing to the CONUS Theater Network Operations and Security Center, a facility historically tied to Army NetOps lineage under NETCOM and the regional cyber center structure. The ARIN registration record shows a top-level autnum registration event dated 1989-09-30 with a last-changed date of 2011-11-01, both confirmed independently by two separate research angles reading the same ARIN RDAP autnum record. Administrative and abuse handling routes through DISA-Columbus's registration mailbox rather than a dedicated Army point of contact, with a registrant address at Fort Huachuca, Arizona. Every routing data source consulted — RIPEstat, CAIDA AS Rank, and bgp.he.net — agrees the ASN is currently dormant: zero announced IPv4 prefixes, zero announced IPv6 prefixes, and zero observed BGP peers, giving it a CAIDA rank near the bottom of the global table (79,459) and a customer cone limited to itself. No dedicated public-facing website or PeeringDB profile could be confirmed for AS525 specifically, and no NANOG or community discussion of the ASN was located, consistent with a non-publicly-routed government allocation with minimal public footprint.

Operator

Headquarters, USAISC (United States Army Information Systems Command); RDAP handle CTNOSC-525-AS [Confirmed] — https://rdap.arin.net/registry/autnum/525

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/525

Allocated

1989-09-30 (ARIN RDAP top-level autnum registration event); last changed 2011-11-01 [Confirmed, corroborated by two independent angles] — https://rdap.arin.net/registry/autnum/525

Org status

Active per ARIN RDAP [Confirmed] — https://rdap.arin.net/registry/autnum/525

Website

Unknown / unverified — no dedicated official site confirmed for AS525 specifically [Unknown]

Contacts

REGIS10-ARIN / Registration (DISA-Columbus), disa.columbus.ns.mbx.arin-registrations@mail.mil, +1-844-347-2457 ext. 2; registrant address Fort Huachuca, AZ 85613 [Confirmed] — https://rdap.arin.net/registry/autnum/525

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-10 — not present in the live Spamhaus ASN-DROP JSON feed, no NANOG mailing-list archive hits, no BGP hijack/route-leak tracker mentions found via search

Network & routing

Network type

U.S. Army / DoD internal network operations entity (CONUS Theater Network Operations and Security Center lineage, historically under NETCOM / regional cyber center structure); not a commercial ISP

[Likely] — https://rdap.arin.net/registry/autnum/525, https://www.army.mil/article/114105/2d_regional_cyber_center_opens

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — https://bgp.he.net/AS525, CAIDA AS Rank API

Routing/peering

NOT announced — 0/327 RIS peers seeing it on v4, 0/321 on v6; CAIDA degree total 0 (customer 0, peer 0, provider 0); 0 observed BGP peers on bgp.he.net and bgp.tools [Confirmed] — https://stat.ripe.net/, https://bgp.he.net/AS525, https://bgp.tools/as/525

Peering policy / PeeringDB

Unknown — no PeeringDB profile found for AS525 specifically (do not infer from sibling USAISC ASNs that do have separate entries) [Unknown] — https://www.peeringdb.com/asn/525

RPKI

not assessable — AS525 announces no prefixes, so there are no ROAs to validate [Unknown/not applicable]

Notable usage

No publicly observed routing activity as of the research date — consistent with a dormant or non-publicly-announced DoD allocation [Confirmed] — https://bgp.he.net/AS525, https://bgp.tools/as/525

Analyst note

Encountered as a dormant legacy DoD ASN. Identity, RIR registration event, and lack of current public routing are all confirmed via ARIN RDAP, RIPEstat, and CAIDA. Network-lineage claim (CTNOSC = CONUS Theater NOSC under Army NetOps) is an inference from the RDAP handle name corroborated by independent Army.mil sources, not a first-party CTNOSC page — tagged Likely rather than Confirmed.