AS7786 — NPAC

AS7786 announces 22 IPv4 prefixes covering 7,424 addresses and 0 IPv6 prefixes.

About this network

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 156.154.0.0 space lands almost entirely on neustar.biz and neulevel.biz hosts — 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 NPAC handle 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 156.154.0.0 space 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.

Announced prefixes

• 156.154.16.0/23
• 156.154.18.0/24
• 156.154.24.0/23
• 156.154.26.0/24
• 156.154.30.0/24
• 156.154.42.0/24
• 156.154.52.0/24
• 156.154.56.0/24
• 156.154.59.0/24
• 156.154.83.0/24
• 156.154.116.0/23
• 156.154.136.0/24
• 156.154.138.0/24
• 156.154.148.0/23
• 156.154.188.0/23
• 156.154.192.0/23
• 156.154.195.0/24
• 156.154.196.0/24
• 156.154.199.0/24
• 156.154.200.0/24
• 156.154.202.0/23
• 209.173.53.0/24

Upstream networks

• AS13335 Cloudflare, Inc.
• AS3257 GTT Communications Inc.
• AS1299 Arelion Sweden AB

Downstream networks

• AS12273 Transunion Interactive, Inc.

Adjacent networks

• AS13335 Cloudflare, Inc.
• AS3257 GTT Communications Inc.
• AS12273 Transunion Interactive, Inc.
• AS1299 Arelion Sweden AB

Routing security

• RPKI: 0 valid, 0 invalid and 25 not-found announcements; 2 ROAs.
• ASPA: none published.
• IRR: 96% of announcements registered; 75 route objects.
• Listed in as-sets: AS-EQUINIX-SG, AS-EQUINIX-SGW, AS-FLEXENTIAL-CUSTOMERS, AS-FLEXENTIAL-TEST2, AS-FRONTIER, AS-GTTCUST, AS-GTTCUST6, AS-LUMOS, AS-LUMOS-TRANSIT, AS-LUMOS-TRANSMIT, AS-NTELOS, AS-NTELOS-TRANSIT, AS-PEAK10_CUSTOMERS, AS-PNAPWDC002, AS-RR-BIZ, AS-TELSTRA-INTL-CUSTOMERS, AS-TRUELI-TU1, AS-UDOS, AS-XO-B, AS13335:AS-CUSTOMERS, AS7473:AS-CUSTOMERS:AS9911.