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Autonomous System

AS52129

Proofpoint, Inc.

Announced IPs
12,288
CIDR prefixes
24
ASN
AS52129

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 v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →

Network profile

Source: PeeringDB →
Geographic scope Global
Traffic ratio Not Disclosed
Peering policy Open

Present at 2 internet exchanges: Equinix Frankfurt: Equinix IX - FR Metro, Equinix Amsterdam: Equinix IX - AM Metro

Top CIDR ranges

CIDRIPsPTR DensityOrganizationCountryStateCity
66.159.232.0/22 1.0K
87.4%
Proofpoint, Inc. US
66.159.244.0/22 1.0K
83.5%
Proofpoint, Inc. US
66.159.252.0/22 1.0K
20.1%
Proofpoint, Inc. US
143.55.144.0/22 1.0K
57.7%
Proofpoint, Inc. US
185.132.180.0/22 1.0K
82.1%
Proofpoint, Inc. GB
185.169.148.0/22 1.0K
0.4%
Proofpoint, Inc. IL
185.183.28.0/22 1.0K
75.2%
Proofpoint, Inc. US
66.159.224.0/23 512
6.4%
Proofpoint, Inc. US
66.159.232.0/23 512
0.0%
Proofpoint, Inc. DE
66.159.236.0/23 512
30.7%
Proofpoint, Inc. US
66.159.244.0/23 512
0.0%
Proofpoint, Inc. DE
66.159.246.0/23 512
0.0%
Proofpoint, Inc. NL
66.159.252.0/23 512
0.0%
Proofpoint, Inc. SA
66.159.254.0/23 512
0.0%
Proofpoint, Inc. AE
91.207.212.0/23 512
91.8%
Proofpoint, Inc. US
143.55.144.0/23 512
0.0%
Proofpoint, Inc. DE Hesse Frankfurt am Main
143.55.148.0/23 512
78.3%
Proofpoint, Inc. US
205.220.184.0/23 512
94.3%
Proofpoint, Inc. US
208.56.4.0/23 512
20.9%
Proofpoint, Inc. US
66.159.234.0/24 256
0.0%
Proofpoint, Inc. NL
66.159.235.0/24 256
0.0%
Proofpoint, Inc. DE
66.159.243.0/24 256
84.0%
Proofpoint, Inc. US
91.207.212.0/24 256
0.0%
Proofpoint, Inc. NL
91.207.213.0/24 256
0.0%
Proofpoint, Inc. US
91.209.104.0/24 256
76.2%
Proofpoint, Inc. US
143.55.146.0/24 256
0.0%
Proofpoint, Inc. DE
143.55.147.0/24 256
0.0%
Proofpoint, Inc. GB
143.55.150.0/24 256
80.5%
Proofpoint, Inc. US
185.169.148.0/24 256
1.6%
Proofpoint, Inc. IL
185.169.151.0/24 256
0.0%
Proofpoint, Inc. IL
205.220.184.0/24 256
0.0%
Proofpoint, Inc. DE Hesse Frankfurt am Main
205.220.185.0/24 256
0.0%
Proofpoint, Inc. NL North Holland Amsterdam
208.56.0.0/24 256
19.1%
Proofpoint, Inc. US
208.56.4.0/24 256
41.8%
Proofpoint, Inc. US
208.56.5.0/24 256
0.0%
Proofpoint, Inc. NL
208.56.6.0/24 256
0.0%
Proofpoint, Inc. US
208.56.17.0/24 256
18.8%
Proofpoint, Inc. US
208.84.64.0/24 256
68.0%
Proofpoint, Inc. US
208.86.200.0/24 256
63.7%
Proofpoint, Inc. US
208.56.0.128/25 128
0.0%
Proofpoint, Inc. IN
208.56.0.0/26 64
0.0%
Proofpoint, Inc. IN
208.56.0.64/27 32
0.0%
Proofpoint, Inc. IN
208.56.0.112/28 16
0.0%
Proofpoint, Inc. US
208.56.0.96/29 8
0.0%
Proofpoint, Inc. IN
208.56.0.104/29 8
0.0%
Proofpoint, Inc. US

BGP Announced Prefixes

Live BGP anomalies →

Prefixes AS52129 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.

PrefixAnnouncement samplesLast seen
143.55.147.0/24 106,287 2026-09-14 00:27:52
66.159.237.0/24 83,688 2026-09-14 00:33:02
66.159.254.0/24 36,140 2026-09-14 00:27:47
66.159.255.0/24 29,639 2026-09-14 00:29:46
66.159.252.0/24 26,708 2026-09-14 00:29:29
91.207.212.0/23 25,908 2026-09-14 00:28:53
66.159.246.0/24 25,723 2026-09-14 00:28:53
66.159.247.0/24 25,689 2026-09-14 00:28:53
66.159.243.0/24 25,497 2026-09-14 00:28:53
66.159.234.0/24 25,476 2026-09-14 00:28:53
91.209.104.0/24 25,364 2026-09-14 00:29:19
143.55.148.0/24 25,298 2026-09-14 00:29:26
143.55.149.0/24 25,135 2026-09-14 00:29:26
143.55.150.0/24 25,092 2026-09-14 00:29:26
185.183.30.0/24 25,087 2026-09-14 00:30:02
185.183.31.0/24 25,073 2026-09-14 00:30:02
185.183.28.0/24 25,058 2026-09-14 00:30:02
185.183.29.0/24 24,636 2026-09-14 00:30:02
185.183.28.0/22 24,591 2026-09-14 00:29:51
208.86.200.0/24 24,258 2026-09-14 00:30:02
208.56.5.0/24 23,841 2026-09-14 00:30:02
208.56.0.0/24 22,313 2026-09-14 00:27:47
66.159.236.0/24 21,438 2026-09-14 00:33:02
66.159.253.0/24 15,097 2026-09-14 00:27:48
185.169.148.0/24 15,090 2026-09-14 00:27:52
66.159.224.0/24 13,863 2026-09-14 00:27:58
205.220.185.0/24 13,823 2026-09-14 00:27:34
66.159.225.0/24 12,313 2026-09-14 00:28:00
208.56.17.0/24 12,077 2026-09-14 00:27:36
66.159.244.0/24 10,790 2026-09-14 00:27:43
66.159.245.0/24 10,779 2026-09-14 00:27:43
143.55.146.0/24 10,685 2026-09-14 00:27:43
143.55.145.0/24 10,625 2026-09-14 00:27:43
208.84.64.0/24 10,540 2026-09-14 00:27:43
66.159.235.0/24 10,487 2026-09-14 00:27:43
66.159.232.0/24 10,439 2026-09-14 00:27:43
66.159.233.0/24 10,427 2026-09-14 00:27:43
143.55.144.0/24 10,342 2026-09-14 00:27:43
205.220.184.0/24 10,242 2026-09-14 00:27:34
185.132.182.0/24 10,206 2026-09-14 00:27:34
185.132.183.0/24 10,191 2026-09-14 00:27:34
208.56.4.0/24 10,190 2026-09-14 00:27:34
185.132.180.0/24 10,184 2026-09-14 00:27:34
208.56.6.0/24 10,181 2026-09-14 00:27:34
185.132.181.0/24 10,071 2026-09-14 00:27:34
185.132.180.0/22 10,051 2026-09-14 00:27:36

Frequently Asked Questions

What is AS52129?

AS52129 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 AS52129 announce?

AS52129 announces 12.3K IPv4 addresses distributed across 24 routed CIDR prefixes. The network is registered in United States.

Who operates AS52129?

AS52129 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 AS52129 registered in?

AS52129 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: 2026-09-14 00:39:06 UTC
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