AS63 Massachusetts Institute of Technology

LL-MI - Massachusetts Institute of Technology · registered in the United States

IPv4 addresses67,58412 prefixes · 0.002% of announced IPv4

Rank in United States#837largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#2,562of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS63 in ASN lookup Look up an IP in this network (129.55.0.1) All networks in United States

IPv4 prefixes

All 12 prefixes, in address order.

129.55.0.0/17
129.55.128.0/18
129.55.192.0/21
129.55.200.0/23
129.55.202.0/23
129.55.204.0/22
129.55.208.0/20
129.55.224.0/19
192.5.136.0/22
192.5.140.0/23
192.26.149.0/24
192.26.150.0/24

Other ASNs named Massachusetts Institute of Technology

3 other networks use the same organisation name; together with AS63 they announce 1,904,639 IPv4 addresses.

ASNNameIPv4 addresses

AS3MIT-GATEWAYS - Massachusetts Institute of Technology US1,836,287

AS396527MIT-PUBWIFI - Massachusetts Institute of Technology US768

AS395326MIT-V6 - Massachusetts Institute of Technology USIPv6 only

Similar-sized networks in United States

ASNNameIPv4 addresses

AS26305#834 ASN-SSM - SSM Health Care67,584

AS344#835 DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)67,584

AS10326#836 WPI - Worcester Polytechnic Institute67,584

AS10441#838 JEG-1 - Jacobs Engineering Group Inc.67,584

AS12005#839 SC-AS - University of South Carolina67,584

AS26298#840 NET-BCBSF-ASN - Florida Blue67,584

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