Autonomous system
AS7786 NPAC
Unclassified ARIN
Summary
Neustar (TransUnion)
enterprise legacy
Neustar's network, now registered to Trans Union, LLC. The ARIN object carries the NEUSTAR-AS1 name; older listings show the handle NPAC, after the Number Portability Administration Center that Neustar ran for the US telephone industry.
What it's used for
- Neustar's own service and corporate infrastructure. Reverse DNS across the announced
156.154.0.0space lands almost entirely onneustar.bizandneulevel.bizhosts — registry, DNS, transfer and test systems rather than customer access networks. - The address space is a cluster of
/24s and/23s carved out of one legacy block, the shape of a company numbering its own services, not selling connectivity.
Notable
- The
NPAChandle outlived the role: administration of US number portability moved away from Neustar in 2018, but the registry object kept the name. - Neustar was acquired by TransUnion in 2021, which is why the ASN's registrant is a credit bureau rather than a telecom company. The name on the AS and the business behind it have drifted apart twice over.
Interesting
- Neustar's
156.154.0.0space is best known publicly for its recursive DNS resolvers, so hosts in this range are often mistaken for a consumer service; the bulk of what this AS announces is back-office and registry infrastructure.
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 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 22 prefixes · 7.42K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 22 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS7786- Registry name
- NEUSTAR-AS1
- Registrant
- Trans Union, LLC
- Abuse contact
- PDLNETWORKOPS@transunion.com
- Registered
- 1997-01-13
- Last changed
- 2026-07-10
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 25 with no ROA
- ROAs
- 2 authorising AS7786
- ASPA
- no ASPA record
- IRR
- 100% registered · 25 of 25 announcements
- Route objects
- 75 naming AS7786
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 1,773 prefixes, as published 2026-10-13. 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