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Autonomous System

AS26211

Proofpoint, Inc.

Announced IPs
14,592
CIDR prefixes
18
ASN
AS26211

Reputation · trust score

A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.

65/100
Moderate
How this score is built

Experimental · trust-vectors model v1.2.1 — a transparent heuristic, not a definitive verdict. How it works →

Top CIDR ranges

CIDRIPsPTR DensityOrganizationCountryStateCity
67.231.144.0/21 2.0K
94.1%
Proofpoint, Inc. US — —
148.163.144.0/21 2.0K
98.4%
Proofpoint, Inc. US — —
205.220.160.0/21 2.0K
97.9%
Proofpoint, Inc. US — —
148.163.132.0/22 1.0K
97.8%
Proofpoint, Inc. US — —
205.220.168.0/22 1.0K
98.8%
Proofpoint, Inc. US — —
208.56.8.0/22 1.0K
92.1%
Proofpoint, Inc. US — —
208.56.56.0/22 1.0K
0.0%
Proofpoint, Inc. US — —
66.159.240.0/23 512
98.2%
Proofpoint, Inc. US — —
66.159.248.0/23 512
98.2%
Proofpoint, Inc. US — —
67.231.158.0/23 512
97.7%
Proofpoint, Inc. US California Sunnyvale
148.163.156.0/23 512
98.8%
Proofpoint, Inc. US — —
205.220.190.0/23 512
23.6%
Proofpoint, Inc. US — —
208.86.202.0/23 512
59.4%
Proofpoint, Inc. US California San Jose
66.159.227.0/24 256
69.9%
Proofpoint, Inc. US — —
67.231.159.0/24 256
98.8%
Proofpoint, Inc. US California Sunnyvale
205.220.186.0/24 256
70.3%
Proofpoint, Inc. US — —
208.56.16.0/24 256
9.0%
Proofpoint, Inc. US — —
208.84.65.0/24 256
96.5%
Proofpoint, Inc. US California Sunnyvale
208.84.66.0/24 256
69.5%
Proofpoint, Inc. US Utah Saratoga Springs
67.231.158.128/25 128
96.9%
Proofpoint, Inc. US — —
67.231.158.64/26 64
96.9%
Proofpoint, Inc. US — —
67.231.158.32/27 32
96.9%
Proofpoint, Inc. US — —
67.231.158.16/28 16
93.8%
Proofpoint, Inc. US — —
67.231.158.0/29 8
100.0%
Proofpoint, Inc. US — —
67.231.158.12/30 4
100.0%
Proofpoint, Inc. US — —
67.231.158.8/31 2
100.0%
Proofpoint, Inc. US — —
67.231.158.10/32 1
100.0%
Proofpoint, Inc. CA — —
67.231.158.11/32 1
100.0%
Proofpoint, Inc. US — —

BGP Announced Prefixes

Live BGP anomalies →

Prefixes AS26211 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.

PrefixAnnouncement samplesLast seen
67.231.158.0/24 40,384 2026-10-15 17:56:53
67.231.159.0/24 40,376 2026-10-15 17:56:53
205.220.190.0/24 35,946 2026-10-15 17:56:53
208.84.65.0/24 26,441 2026-10-15 17:56:40
148.163.135.0/24 26,258 2026-10-15 17:56:40
208.56.16.0/24 25,868 2026-10-15 18:26:36
67.231.150.0/24 18,949 2026-10-15 17:57:41
67.231.151.0/24 18,924 2026-10-15 17:57:41
205.220.191.0/24 18,708 2026-10-15 18:21:41
208.84.66.0/24 18,095 2026-10-15 17:56:53
208.86.202.0/24 14,252 2026-10-15 17:56:53
148.163.156.0/23 12,652 2026-10-15 17:56:53
148.163.145.0/24 12,611 2026-10-15 17:56:53
148.163.147.0/24 12,390 2026-10-15 17:56:53
67.231.148.0/24 12,357 2026-10-15 17:56:53
66.159.241.0/24 12,356 2026-10-15 17:56:53
66.159.248.0/23 12,353 2026-10-15 17:56:53
67.231.146.0/24 12,340 2026-10-15 17:56:53
148.163.133.0/24 12,334 2026-10-15 17:56:53
148.163.148.0/22 12,327 2026-10-15 17:56:53
67.231.144.0/24 12,317 2026-10-15 17:56:53
67.231.145.0/24 12,313 2026-10-15 17:56:53
67.231.149.0/24 12,313 2026-10-15 17:56:53
66.159.227.0/24 12,312 2026-10-15 17:56:53
148.163.146.0/24 12,309 2026-10-15 17:56:53
148.163.144.0/24 12,308 2026-10-15 17:56:53
148.163.132.0/24 12,306 2026-10-15 17:56:53
67.231.147.0/24 12,279 2026-10-15 17:56:53
66.159.240.0/24 12,276 2026-10-15 17:56:53
148.163.134.0/24 12,273 2026-10-15 17:56:53
208.56.8.0/24 12,093 2026-10-15 17:56:53
205.220.161.0/24 12,084 2026-10-15 17:56:53
205.220.160.0/24 12,075 2026-10-15 17:56:53
208.56.9.0/24 12,058 2026-10-15 17:56:53
208.56.10.0/24 12,046 2026-10-15 17:56:53
208.56.11.0/24 12,045 2026-10-15 17:56:53
205.220.186.0/24 12,037 2026-10-15 17:56:53
205.220.171.0/24 12,037 2026-10-15 17:56:53
208.86.203.0/24 12,027 2026-10-15 17:56:53
205.220.163.0/24 12,019 2026-10-15 17:56:53
205.220.165.0/24 12,016 2026-10-15 17:56:53
205.220.169.0/24 12,013 2026-10-15 17:56:53
205.220.170.0/24 11,999 2026-10-15 17:56:53
205.220.167.0/24 11,998 2026-10-15 17:56:53
205.220.166.0/24 11,996 2026-10-15 17:56:53
205.220.168.0/24 11,992 2026-10-15 17:56:53
205.220.164.0/24 11,989 2026-10-15 17:56:53
205.220.162.0/24 11,947 2026-10-15 17:56:53
208.56.57.0/24 7,644 2026-10-15 17:56:53
208.56.58.0/24 7,613 2026-10-15 17:56:53

Showing top 50 of 52 announced prefixes by sample volume.

Frequently Asked Questions

What is AS26211?

AS26211 is an Autonomous System Number assigned to Proofpoint, Inc.. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).

How many IP addresses does AS26211 announce?

AS26211 announces 14.6K IPv4 addresses distributed across 18 routed CIDR prefixes. The network is registered in United States.

Who operates AS26211?

AS26211 is operated by Proofpoint, Inc.. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.

What country is AS26211 registered in?

AS26211 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.

Last updated: 2026-10-15 18:54:05 UTC
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