AS13998 University of Texas Southwestern Medical Center

SWMED - University of Texas Southwestern Medical Center · registered in the United States

IPv4 addresses85,50420 prefixes · 0.003% of announced IPv4

Rank in United States#691largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#2,074of 79,396 networks with IPv4

IPv61 x /481 prefixes

CountryUnited States18,679 ASNs registered there

Open AS13998 in ASN lookup Look up an IP in this network (129.112.0.1) All networks in United States

IPv4 prefixes

All 20 prefixes, in address order.

129.112.0.0/18
129.112.64.0/19
129.112.96.0/21
129.112.104.0/22
129.112.108.0/23
129.112.110.0/23
129.112.112.0/22
129.112.116.0/22
129.112.120.0/21
129.112.128.0/17
198.215.36.0/22
198.215.48.0/20
198.215.96.0/20
198.215.176.0/20
198.241.16.0/20
199.165.152.0/23
199.165.154.0/24
199.242.234.0/23
199.242.236.0/22
199.249.214.0/24

IPv6 prefixes

All 1 prefix.

2620:0:840::/48

Similar-sized networks in United States

ASNNameIPv4 addresses

AS7227#688 KPMGL-AS - KPMG LLP86,016

AS36441#689 UGA-ASN - University of Georgia86,016

AS3807#690 UMTNET-ASN - University of Montana85,760

AS27589#692 MOJOHOST - MOJOHOST84,992

AS46687#693 MAXXSOUTH-BROADBAND - BCI Mississippi Broadband,LLC83,968

AS53610#694 METRO-COMMUNICATIONS-COMPANY - Metro Communications Company, Inc.83,968

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