AS26211 Proofpoint, Inc.

PROOFPOINT-ASN-US-WEST - Proofpoint, Inc. · registered in the United States

IPv4 addresses14,59218 prefixes · <0.001% of announced IPv4

Rank in United States#2,492largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#7,451of 79,396 networks with IPv4

IPv64 x /482 prefixes

CountryUnited States18,679 ASNs registered there

Open AS26211 in ASN lookup Look up an IP in this network (66.159.227.1) All networks in United States

IPv4 prefixes

All 18 prefixes, in address order.

66.159.227.0/24
66.159.240.0/23
66.159.248.0/23
67.231.144.0/21
67.231.158.0/23
148.163.132.0/22
148.163.144.0/21
148.163.156.0/23
205.220.160.0/21
205.220.168.0/22
205.220.186.0/24
205.220.190.0/23
208.56.8.0/22
208.56.16.0/24
208.56.56.0/22
208.84.65.0/24
208.84.66.0/24
208.86.202.0/23

IPv6 prefixes

All 2 prefixes.

2620:100:9000::/47
2620:100:900c::/47

Other ASNs named Proofpoint, Inc.

2 other networks use the same organisation name; together with AS26211 they announce 28,672 IPv4 addresses.

ASNNameIPv4 addresses

AS22843PROOFPOINT-ASN-US-EAST - Proofpoint, Inc. US12,800

AS13916PROOFPOINT-UT7 - Proofpoint, Inc. US1,280

Similar-sized networks in United States

ASNNameIPv4 addresses

AS20303#2489 BAM - BAM Broadband Opco, LLC14,592

AS8052#2490 TWC-8052-PEAKVIEW - Charter Communications Inc14,592

AS10397#2491 MOMENTUM - Momentum Telecom, Inc.14,592

AS7359#2493 CENTURYLINK-SPA-ZUNI - CenturyLink Communications, LLC14,592

AS4208#2494 THE-ISERV-COMPANY - The Iserv Company, LLC14,592

AS10747#2495 EPIC-HOSTING - Epic Hosting, LLC14,592

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources