asn.dev

Autonomous system

AS33633 USG-CORPORATION

Unclassified ARIN

IPv4 addresses 1.54K 3 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 3 0 downstream
Flagged prefixes 0 none

Summary

USG Corporation

United States of America · AI-generated

business corporate manufacturing internal

The AS handle USG-CORPORATION is held by USG Corporation, a major North American manufacturer of gypsum-based building materials.

What it's used for

  • The address space carries internal corporate traffic, evidenced by the netname USGCOR-4CLASSC-CHIIL-64-43-232-0-22 and reverse DNS entries like host.skivemedia.com and mynp2.com.
  • The AS announces 1536 IPv4 addresses across 3 prefixes with only 3 observed neighbours, a ratio that indicates a small, self-contained internal network rather than a transit or access provider.

Notable

  • Registrants are mixed: the largest prefix is registered to USG Corporation, Inc., while 8.26.176.0/24 is registered to Level 3 Parent, LLC and 66.225.192.0/24 to DEFT.COM, suggesting leased or historically acquired space.
  • The inventory consists of three distinct IPv4 blocks with no IPv6 prefixes, reflecting a legacy corporate estate that has not expanded into modern dual-stack operations.

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

3 upstream, 0 downstream and 3 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS23352DEFT.COM225
AS3356Level 3 Parent, LLC69
AS174Cogent Communications, LLC2

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-19, 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 3 prefixes · 1.54K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America3

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS33633
Registry name
USG-CORPORATION
Registrant
USG Corporation, Inc.
Abuse contact
BJensen@usg.com
Registered
2005-02-09
Last changed
2012-03-02
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 5 with no ROA
ROAs
0 authorising AS33633
ASPA
no ASPA record
IRR
80% registered · 4 of 5 announcements
Route objects
5 naming AS33633

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 1,778 prefixes, as published 2026-10-20. 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