AS11971 Pfizer Inc.

PFIZERNET-GROTON - Pfizer Inc. · registered in the United States

IPv4 addresses55,29625 prefixes · 0.002% of announced IPv4

Rank in United States#1,452largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#3,781of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS11971 in ASN lookup Look up an IP in this network (146.240.1.1) All networks in United States

IPv4 prefixes

All 25 prefixes, in address order.

146.240.1.0/24
148.168.0.0/19
148.168.32.0/22
148.168.36.0/22
148.168.40.0/21
148.168.48.0/20
148.168.65.0/24
148.168.66.0/23
148.168.68.0/22
148.168.72.0/22
148.168.78.0/23
148.168.84.0/22
148.168.88.0/21
148.168.128.0/18
148.168.192.0/23
148.168.194.0/23
148.168.196.0/22
148.168.200.0/21
148.168.208.0/21
148.168.218.0/23
148.168.220.0/22
148.168.224.0/22
148.168.228.0/22
148.168.232.0/21
148.168.240.0/20

Other ASNs named Pfizer Inc.

2 other networks use the same organisation name; together with AS11971 they announce 66,304 IPv4 addresses.

ASNNameIPv4 addresses

AS7068PFIZERNET - Pfizer Inc. US10,240

AS36393PFELJ - Pfizer Inc. US768

Similar-sized networks in United States

ASNNameIPv4 addresses

AS32035#1449 CCDT-AS - Sangoma US Inc.55,296

AS2165#1450 HPINC - HP Inc.55,296

AS11452#1451 MOUNT-SINAI - Mount Sinai School of Medicine55,296

AS398993#1453 PEG-TY - PEG TECH INC55,296

AS14852#1454 DCX - DaimlerChrysler Corporation55,040

AS33387#1455 NOCIX - Nocix, LLC54,784

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