asn.dev

Autonomous system

AS19231 NBCUNI

Unclassified ARIN

IPv4 addresses 1.28K 4 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

NBCUniversal

United States of America · AI-generated

media corporate business

NBCUNI is operated by NBCUniversal.

What it's used for

  • The address space carries corporate infrastructure for the media company, evidenced by netnames NBCUNI and NBC-UNIVERSAL registered to NBCUniversal; NBCU Technical.
  • The AS announces 1280 IPv4 addresses across 4 prefixes with only 3 observed neighbours, indicating a small internal corporate estate rather than a transit or access network.

Notable

  • Registrants largely align with the announcer, with NBCUniversal; NBCU Technical listed for three of the four prefixes.
  • One prefix, 50.203.232.0/24, is registered to Comcast Cable Communications, LLC with netname CCCH3-4, reflecting the corporate relationship between NBCUniversal and its parent company Comcast.
  • The inventory consists of four distinct IPv4 blocks, including a /23 and three /24s, with no IPv6 prefixes announced.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

2 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS7922Comcast Cable Communications, LLC188
AS3257GTT Communications Inc.102

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 4 prefixes · 1.28K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America4

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS19231
Registry name
NBCUNI
Registrant
NBCUniversal
Abuse contact
sralerts@nbcuni.com
Registered
2006-12-13
Last changed
2020-07-10
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
20% valid · 1 valid, 4 with no ROA
ROAs
2 authorising AS19231
ASPA
no ASPA record
IRR
60% registered · 3 of 5 announcements
Route objects
1 naming AS19231

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 1,781 prefixes, as published 2026-10-16. 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

Cross-check