asn.dev

Autonomous system

AS26211 PROOFPOINT-ASN-US-WEST

Unclassified ARIN

IPv4 addresses 14.59K 18 prefixes
IPv6 prefixes 2 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 6 0 downstream
Flagged prefixes 0 none

Summary

Proofpoint

United States of America · AI-generated

security business enterprise cloud

The AS handle PROOFPOINT-ASN-US-WEST is held by Proofpoint, Inc.

What it's used for

  • The address space carries enterprise cybersecurity infrastructure, evidenced by reverse DNS entries such as mx0a-009e9401.pphosted.com and pod-outbound.proofpoint.com.
  • The network announces 14,592 IPv4 addresses across 18 prefixes and 2 IPv6 prefixes, with only 6 observed neighbours, indicating a dedicated corporate estate rather than a transit or access provider.

Notable

  • Registrants are predominantly Proofpoint, Inc., with netnames like PROOFPOINT-NET-NORTH-AMERICA and PROOF, though two prefixes (208.56.8.0/22 and 208.56.56.0/22) list Meta Networks Inc as the registrant.
  • The address inventory is finely subdivided into multiple /21, /22, /23, and /24 blocks, consistent with site-by-site segmentation for an internal corporate network.

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

6 upstream, 0 downstream and 10 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS3356Level 3 Parent, LLC1,594
AS174Cogent Communications, LLC1,094
AS1299Arelion Sweden AB260
AS21949Beanfield Technologies Inc.174
AS32323Equinix, Inc.38
AS33651Comcast Cable Communications, LLC5

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

Shape and geography

IPv4 18 prefixes · 14.59K addresses IPv6 2 prefixes

CountryNamePrefixes
USUnited States of America20

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS26211
Registry name
PROOFPOINT-ASN-US-WEST
Registrant
Proofpoint, Inc.
Abuse contact
abuse@proofpoint.com
Registered
2007-10-31
Last changed
2012-02-24
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 55 valid, 0 with no ROA
ROAs
8 authorising AS26211
ASPA
no ASPA record
IRR
80% registered · 44 of 55 announcements 4 other origin
Route objects
44 naming AS26211

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

Cross-check