AS634

AS634 is a U.S. Department of Defense autonomous system number that sits inside the ARIN-registered block DNIC-ASBLK-00616-00665, a 50-ASN range spanning AS616 through AS665 and registered as a single autnum resource to the DoD (ARIN org handle USDDD). Because ARIN issued this range as one block rather than as individually numbered autnum objects, RDAP lookups for AS634 resolve to the block-level record; the block's top-level registration event dates to 1990-04-19, with a last-changed timestamp of 2025-09-12 reflecting routine record maintenance rather than a re-allocation. Operationally the ASN is lightly but actively announced: RIPEstat shows six originated IPv4 prefixes (roughly 2,560 addresses) rooted in the 214.58.0.0/16 and 215.67.57.0/24 ranges, no IPv6 announcements, and a Columbus, Ohio administrative footprint tied to DISA's Defense Information Systems Agency contacts. CAIDA AS Rank places AS634 at 25,416 (mid-table among ranked ASes, a middling rather than a bottom-tier position) with a customer cone of exactly 1 ASN — itself, no downstream customers — and a topology degree of one peer relationship and zero formal providers, consistent with a small, closed government network rather than a transit-heavy operator. RIPEstat separately observes 2 BGP neighbours in its routing table, historically attributed to AS367 and AS149 by third-party looking-glass sites, though CAIDA's degree classification does not confirm either as a formal provider or customer. No public abuse, hijack, or blocklist signal was found as of 2026-07-17.

Operator / registrant

United States Department of Defense (DoD), ARIN org handle USDDD [Confirmed] — https://rdap.arin.net/registry/autnum/634, https://ipinfo.io/AS634

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/634

Allocated

1990-04-19 (ARIN autnum top-level "registration" event for the DNIC-ASBLK-00616-00665 block containing AS634 — a first-party RIR registry fact, independently corroborated by four research angles and by bgp.tools's "Registered on 19 Apr 1990"); last changed 2025-09-12 (record-maintenance timestamp, not a re-allocation)

[Confirmed] — https://rdap.arin.net/registry/autnum/634, https://bgp.tools/as/634

Org status

active (ARIN RDAP status = active for the containing block) [Confirmed] — https://rdap.arin.net/registry/autnum/634

Website

no dedicated public site for AS634 itself; contacts route to DISA, whose general site is disa.mil [Likely] — https://www.disa.mil/, https://rdap.arin.net/registry/autnum/634

Contacts

NOC/technical/abuse — disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil; registration — disa.columbus.ns.mbx.arin-registrations@mail.mil; phone +1-844-347-2457 ext. 2 [Confirmed] — https://rdap.arin.net/registry/autnum/634

Security/abuse context (NEUTRAL, DATED)

not on Spamhaus ASN-DROP as of a live check on 2026-07-17; no NANOG-archive, Cisco Talos, or BGP-hijack/route-leak reports naming AS634 found via search; bgp.he.net flags "announces bogons" on its summary page, unverified beyond that source and noted for awareness only

Network & routing

Network type

government/military network operator, not a commercial ISP, hosting, or content network [Confirmed] — https://rdap.arin.net/registry/autnum/634, https://ipinfo.io/AS634

Size / routing

6 originated IPv4 prefixes (214.58.221.0/24, 214.58.220.0/24, 214.58.156.0/23, 214.58.223.0/24, 215.67.57.0/24, 214.58.144.0/22; ≈2,560 addresses), 0 IPv6 prefixes [Confirmed] — https://stat.ripe.net/AS634, https://bgp.he.net/AS634, https://bgp.tools/as/634

AS rank

25,416 (CAIDA AS Rank; seen:true, cliqueMember:true) — a mid-table position, not near the bottom, reflecting AS634's small but stably announced footprint [Confirmed] — https://asrank.caida.org/asns/634

Customer cone / peers

CAIDA customer cone = 1 ASN (singleton — AS634 itself, no downstream customer ASNs); CAIDA topology degree = 1 total (0 providers, 1 peer, 0 customers) [Confirmed] — https://asrank.caida.org/asns/634. RIPEstat's routing-status separately counts 2 observed BGP neighbours, which bgp.tools and bgp.he.net attribute to AS367 and AS149 (both DoD-internal ASNs); this routing-table pairing is not reflected in CAIDA's provider/customer degree split, so it is reported as an observed adjacency rather than a confirmed upstream/downstream relationship

[Likely] — https://stat.ripe.net/AS634, https://bgp.tools/as/634, https://bgp.he.net/AS634

Peering policy

no ASN-specific public policy or PeeringDB entry (api/net?asn=634 → 404); DoD's general interconnection framework requires DoD CIO mission-justification approval and routes through approved gateways per the DISN Connection Process Guide, but this is not AS634-specific

[Likely] — https://www.peeringdb.com/api/net?asn=634, https://dl.dod.cyber.mil/wp-content/uploads/connect/CPG/ConnProcGuide.html

RPKI

not directly evaluated (RIPEstat rpki-validation requires a --prefix param, not supplied); bgp.he.net and bgp.tools show no RPKI-valid or RPKI-invalid origins recorded, i.e. RPKI-unknown rather than RPKI-invalid [Likely] — https://bgp.he.net/AS634, https://bgp.tools/as/634

Geo footprint

US only; RDAP contacts at 300 North James Road, Whitehall, OH 43213 (DISA-Columbus) and registrant address 3990 E. Broad Street, Columbus, OH 43218 [Confirmed] — https://rdap.arin.net/registry/autnum/634

Notable usage

part of the DoD's DNIC-managed ASN space; no source ties AS634 specifically to a named sub-network (e.g. NIPRNet vs. DREN) beyond the generic DoD registrant [Likely] — https://en.wikipedia.org/wiki/NIPRNet

ASN / block

AS634, part of DNIC-ASBLK-00616-00665 (AS616–AS665, 50 ASNs registered as one ARIN autnum resource) [Confirmed] — https://rdap.arin.net/registry/autnum/634

Analyst note

block-level RDAP record (no individually numbered AS634 autnum object), no PeeringDB net record, consistent with a closed DoD government network with minimal public footprint; CAIDA AS Rank (25,416) and cone (1 ASN, 1 peer, 0 customer, 0 provider) added this cycle to replace a prior null abstention.