Autonomous system detail

AS640

Not announced

Operated by DNIC-ASBLK-00616-00665 - United States Department of Defense (DoD).

Summary

// analyst note
Dormant, unrouted ASN within a DoD block-level ARIN registration. Allocation date taken strictly from the autnum top-level events[], excluding nested contact/org registration dates. No PeeringDB record, no public peering policy, no abuse-feed listing found.
// security note
NEUTRAL/DATED: no listing found in Spamhaus ASN-DROP as of 2026-07-17; no ASN-640-specific abuse or incident reports found in public sources.
IPv4 prefixes
0
~0 addresses
IPv6 prefixes
0
—
Peer networks
0
0 up · 0 down
IANA block
1-1876
Assigned by ARIN
[ 01 ] — Context

About this ASN.

Updated  ·  Confidence: High

AS640 is a legacy autonomous system number that sits inside the ARIN block registration DNIC-ASBLK-00616-00665, spanning AS616 through AS665, held by the United States Department of Defense (DoD) and administered day-to-day by the Defense Information Systems Agency (DISA) out of Columbus, Ohio. The block-level ARIN RDAP autnum record carries a top-level registration event dated 1990-04-19, which is the ASN's authoritative allocation date — distinct from, and not to be confused with, the later registration dates on the record's nested contact entities (MIL-HSTMST-ARIN registered 1993-05-26, USDDD org attachment 2007-01-12, REGIS10-ARIN registered 2009-06-24), which are contact/role-record artifacts rather than allocation events. Operationally, AS640 is dormant: RIPEstat routing-status shows zero announced IPv4 and IPv6 prefixes, zero of 326 RIS peers observing v4 announcements and zero of 321 for v6, and CAIDA AS Rank places it at 79,459 with a customer cone of exactly one ASN (itself) and zero prefixes or addresses. No PeeringDB network object exists for this ASN, and no dedicated operator or peering-policy page names it specifically. No abuse or security-incident signal was found tying AS640 to any Spamhaus, threat-intel, or NANOG-archive listing as of this check.

Operator
United States Department of Defense (DoD); administered by DISA-Columbus (registrant handle USDDD, 3990 E. Broad Street, Columbus, OH 43218) [Confirmed] — https://rdap.arin.net/registry/autnum/640
Country / RIR
US, ARIN [Confirmed] — https://stat.ripe.net/AS640 (abuse-contact-finder authoritative_rir: arin)
Allocated date
1990-04-19, taken from the autnum's top-level events[] "registration" entry (not the nested entity/org registration dates of 1993, 2007, or 2009, which are contact-record artifacts); last changed 2025-09-12 [Confirmed, corroborated by two independent angles] — https://rdap.arin.net/registry/autnum/640
Website
no dedicated operator or ASN-specific page found; DISA's general corporate site is https://www.disa.mil/ but has no AS640-specific content [Confirmed] — https://www.disa.mil/
Org status
Active per ARIN RDAP [Confirmed] — https://rdap.arin.net/registry/autnum/640

Abuse contact

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

[Confirmed] — https://stat.ripe.net/AS640

Security/abuse context (NEUTRAL, DATED)

no listing found in Spamhaus ASN-DROP's full JSON feed (419 entries, checked 2026-07-17); no ASN-640-specific NANOG-archive or abuse-report hits found; absence of evidence, not proof of a clean record, given minimal public routing exposure

[Likely] — https://www.spamhaus.org/drop/asndrop.json

Network & routing

Network type
government/military network; not a commercial ISP, hosting provider, or content network [Confirmed] — https://rdap.arin.net/registry/autnum/640
Routing status
NOT announced — 0 IPv4 and 0 IPv6 prefixes, 0 of 326 v4 RIS peers and 0 of 321 v6 RIS peers observing it, 0 observed neighbours [Confirmed] — https://stat.ripe.net/AS640
CAIDA AS Rank
79,459; customer cone = singleton (1 ASN, 0 prefixes, 0 addresses); asnDegree total/customer/peer/provider all 0; cliqueMember false [Confirmed] — https://asrank.caida.org/asns/640
Peering
no PeeringDB network object found (API query returned 404); no public DoD/DISA peering-policy page names AS640 specifically [Confirmed] — https://www.peeringdb.com/api/net?asn=640
RPKI
not assessable — RIPEstat rpki-validation requires a specific prefix and AS640 announces none [Confirmed] — https://stat.ripe.net/AS640
Geo footprint
US (confirmed via both CAIDA country.iso and the RDAP registrant address); CAIDA lat/long of 0,0 is its null-location placeholder, not a real coordinate [Confirmed] — https://rdap.arin.net/registry/autnum/640, https://asrank.caida.org/asns/640
ASN
AS640 [Confirmed] — https://rdap.arin.net/registry/autnum/640
Block registration
DNIC-ASBLK-00616-00665, ARIN handle AS616, spanning AS616–AS665 [Confirmed] — https://rdap.arin.net/registry/autnum/640
Analyst note
AS640 has no independent operator identity — it is one number within a single DoD block-level ARIN registration, unrouted in the public DFZ, with no PeeringDB presence and no public abuse signal.
[ 02 ] — Announced prefixes

What this network routes.

0 prefixes total · RIPEstat data · cached, not real-time
// IPv4 prefixes0
No IPv4 prefixes announced.
// IPv6 prefixes0
No IPv6 prefixes announced.
[ 03 ] — Notable peers & upstreams

Who it talks to.

0 observed neighbours
Neighbour data unavailable from public BGP collectors.