AS40831 Mass General Brigham Incorporated

PHS - Mass General Brigham Incorporated · registered in the United States

IPv4 addresses196,86411 prefixes · 0.006% of announced IPv4

Rank in United States#335largest network in US by IPv4 space, of 18,338 · 0.01% of US

Rank worldwide#1,113of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS40831 in ASN lookup Look up an IP in this network (132.183.0.1) All networks in United States

IPv4 prefixes

All 11 prefixes, in address order.

132.183.0.0/16
155.52.0.0/16
160.72.231.0/24
170.223.0.0/21
170.223.8.0/22
170.223.12.0/23
170.223.14.0/23
170.223.16.0/20
170.223.32.0/19
170.223.64.0/18
170.223.128.0/17

Similar-sized networks in United States

ASNNameIPv4 addresses

AS26#332 CORNELL - Cornell University197,376

AS1999#333 HOUSE-AS-1 - U.S. House of Representatives197,376

AS1600#334 DNIC-ASBLK-01550-01601 - United States Department of Defense (DoD)197,120

AS5774#336 USPS-001 - United States Postal Service196,608

AS331#337 DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)196,608

AS335#338 DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)196,608

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