Autonomous system profile

Review registration details, announced prefixes, network relationships and historical snapshots.

AS331

Announcement observedARIN

United States Department of Defense (DoD) · DNIC-ASBLK-00306-00371

This profile is assembled from CHA.LA's normalized registration, routing and observation snapshots.

Last active11/1/2026, 00:00:36Snapshot expired

View network topology RDAP registration

ASN: AS331
Registration country: United States
Name: United States Department of Defense (DoD)
Abbreviation: DNIC-ASBLK-00306-00371
Registration date: 6/30/1989, 04:00:00
Status: Announcement observed
RIR: ARIN

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
55.19.0.0/16BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/31/2026, 08:00:00	✓	×	Currently valid
55.19.2.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/31/2026, 08:00:00	✓	×	Currently valid
55.65.0.0/16BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/31/2026, 08:00:00	✓	×	Currently valid
55.70.0.0/16BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/31/2026, 08:00:00	✓	×	Currently valid
55.70.190.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/31/2026, 08:00:00	✓	×	Currently valid

BGP prefixes have no geographic country; the column is marked not applicable.

Registration and sources

Organization: United States Department of Defense (DoD)
RIR: ARIN
Registration country: United States
Registration date: 6/30/1989, 04:00:00
Abuse contact: disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil

Snapshot trend

11/1/2026, 00:00:365 v41 v61 Upstream · 0 Uncertain

10/31/2026, 16:28:255 v41 v61 Upstream · 0 Uncertain

9/29/2026, 06:15:005 v41 v61 Upstream · 0 Uncertain

ASN route snapshotThis page reads collected ASN, prefix, relationship and history data. External interfaces are used for initial collection and scheduled refreshes.Source keys: cha-la-external-routing · iana-rdap-asn-bootstrap · rir-rdap-asn