AS571

AS571 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (organization handle USDDD), carrying the historical DoD Network Information Center (DNIC) name DNIC-AS-00571 assigned when DoD's early ASNs were registered in 1990. The ASN's operational management traces to the Defense Information Systems Agency (DISA), which runs the Defense Information System Network (DISN); the registrant address is DISA's Columbus, OH facility, and the abuse/NOC contact is DISA-Columbus. Unlike commercial ISPs, AS571 has no dedicated public operator website, published peering policy, or PeeringDB listing — DISA's organization page (org id 17705) lists 20 other DoD ASNs but not AS571, consistent with DoD's practice of not publishing per-ASN operator detail. Routing data shows AS571 currently announces roughly 62–63 IPv4 prefixes (mostly /24 blocks within the historically dark 214.0.0.0/8 and 215.0.0.0/8 DoD-assigned Class-A space) plus a single IPv6 /48, single-homed to one observed adjacency, AS27064 (also a DoD Network Information Center ASN), with no other peers or customers — a topology typical of a closed government network rather than a transit or hosting network. CAIDA ASRank places AS571 at global rank 15314 with a customer cone of exactly 1 ASN (itself; asnDegree total 1, provider 1, peer 0, customer 0), 63 prefixes, and 26,624 addresses — confirming a stub network that originates its own space but neither transits traffic for others nor carries any downstream customers. bgp.he.net's automated analysis flags "AS571 announces bogons" for its 214.x/215.x prefixes; this most likely reflects stale third-party bogon/fullbogon filter lists that have not caught up to DoD's legitimate use of this historically-reserved space, not a security incident — no first-party bogon-list source was checked to confirm current status, and no abuse, spam, or malicious-activity listings were found for AS571 across Spamhaus, abuse.ch/URLhaus, AbuseIPDB-adjacent resources, or NANOG archives as of 2026-07-11.

Country / RIR

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

Allocated

1990-01-16 — read from the RDAP autnum TOP-LEVEL events[] (eventAction: "registration"), independently corroborated by bgp.tools ("registered since 16 Jan 1990"); entity-level POC dates (MIL-HSTMST-ARIN 1993-05-26, REGIS10-ARIN 2009-06-24) are contact-record dates, correctly excluded as decoys. Last changed: 2025-09-12 (autnum top-level "last changed")

[Confirmed] — https://rdap.arin.net/registry/autnum/571, https://bgp.tools/as/571

Website / operator page

none dedicated to AS571; closest public authority is DISA (https://www.disa.mil/), which does not name AS571 by number [Likely] — https://www.disa.mil/

Org status

active, registered under ARIN org handle USDDD (United States Department of Defense) [Confirmed] — https://rdap.arin.net/registry/autnum/571

Abuse contact

disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-11 across Spamhaus ASN-DROP, abuse.ch/URLhaus, AbuseIPDB-adjacent resources, community bad-ASN lists, or NANOG archives — the only relevant NANOG thread found discusses unrelated Spamhaus blacklisting of AS47158/AS141011 for RIR-policy revocations, not AS571; consistent with a closed, single-peer government network

Network & routing

Network type

government/military — internal DoD Information Network (DoDIN) infrastructure, not a commercial ISP or transit provider [Confirmed] — https://whois.arin.net/rest/asn/AS571.html

Peering policy

not published; AS571 does not appear on DoD's PeeringDB organization page (org 17705), which lists 20 other DoD ASNs (AS3529, AS616, AS5189, AS360, AS27081, AS126, AS650, AS325, AS749, AS303, AS725, AS654, AS147, AS769, AS3541, AS244, AS95, AS138, AS39, AS124) but not AS571

[Confirmed] — https://www.peeringdb.com/org/17705

Routing

~62–63 announced IPv4 prefixes (mostly /24s plus one /18, 214.26.64.0/18) and 1 IPv6 /48; sole peer/upstream AS27064 (DoD Network Information Center); no downstream customers [Confirmed] — https://bgp.he.net/AS571, https://bgp.tools/as/571

AS rank / customer cone

CAIDA ASRank 15314; customer cone = 1 ASN (asnDegree total 1, provider 1, peer 0, customer 0), 63 prefixes, 26,624 addresses — matches RIPEstat routing counts exactly [Confirmed] — https://api.asrank.caida.org/v2/restful/asns/571, https://asrank.caida.org/asns/571

RPKI posture

Unknown — RIPEstat rpki-validation requires a specific prefix (not supplied); no ROA valid/invalid counts surfaced by bgp.he.net or bgp.tools [Unknown]

Geo footprint

United States only — registrant address Columbus, OH 43218; NOC/abuse POC (DISA-Columbus) Whitehall, OH 43213 [Confirmed] — https://rdap.arin.net/registry/autnum/571

ASN / name

AS571, DNIC-AS-00571 [Confirmed] — https://rdap.arin.net/registry/autnum/571

Registrant / operator

United States Department of Defense (DoD), ARIN org handle USDDD, 3990 E. Broad Street, Columbus, OH 43218; operationally managed by DISA (Defense Information Systems Agency) [Confirmed] — https://rdap.arin.net/registry/autnum/571, https://whois.arin.net/rest/asn/AS571.html

Status

active [Confirmed] — https://rdap.arin.net/registry/autnum/571

Address-space estimate

~26,624 IPv4 addresses originated (~104 /24-equivalents) [Confirmed] — https://bgp.he.net/AS571, https://stat.ripe.net/AS571

Data-quality flag

bgp.he.net labels AS571 as announcing "bogons" for 214.x/215.x space; assessed as a likely stale third-party filter-list artifact given the space is legitimately DoD-registered, not a confirmed abuse finding [Likely] — https://bgp.he.net/AS571