Autonomous system
AS1321 ANSBB-ASNNET-1
Unclassified ARIN
Summary
Advanced Network & Services (Verizon)
transit legacy
ANSBB-ASNNET-1, a backbone network of Advanced Network & Services (ANS), the organization that built and operated the NSFNET T3 backbone. It is now held by Verizon Business.
What it's used for
- Legacy backbone networking, now part of Verizon Business.
Notable
- ANS was central to the early US internet, operating the NSFNET backbone that seeded today's commercial internet.
Interesting
- See also AS1323, another ANS backbone allocation under the same handle.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 20 prefixes · 5.89K addresses IPv6 5 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 25 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS1321- Registry name
- ANSBB-ASNNET-1
- Registrant
- Verizon Business
- Abuse contact
- abuse@verizon.com
- Registered
- 1994-11-23
- Last changed
- 2024-03-04
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 31 with no ROA
- ROAs
- 0 authorising AS1321
- ASPA
- no ASPA record
- IRR
- 58% registered · 18 of 31 announcements
- Route objects
- 29 naming AS1321
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,783 prefixes, as published 2026-10-17. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere