AS52129 PROOFPOINT-ASN-EU Proofpoint, Inc.

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

IPv4 addresses11,52021 prefixes · <0.001% of announced IPv4

Rank in United States#2,779largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#8,453of 79,396 networks with IPv4

IPv632 x /481 prefixes

CountryUnited States18,679 ASNs registered there

Open AS52129 in ASN lookup Look up an IP in this network (66.159.224.1) All networks in United States

IPv4 prefixes

All 21 prefixes, in address order.

66.159.224.0/23
66.159.232.0/22
66.159.236.0/23
66.159.243.0/24
66.159.244.0/22
66.159.252.0/22
91.207.212.0/23
91.209.104.0/24
143.55.144.0/22
143.55.148.0/23
143.55.150.0/24
185.132.180.0/22
185.169.148.0/24
185.183.28.0/22
205.220.184.0/23
208.56.0.0/24
208.56.4.0/23
208.56.6.0/24
208.56.17.0/24
208.84.64.0/24
208.86.200.0/24

IPv6 prefixes

All 1 prefix.

2a0a:2b00::/43

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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