AS13998
University of Texas Southwestern Medical Center
ARIN US active Announced
More ASNs in the United States → Organization
University of Texas Southwestern Medical Center
SWMED
Registered
Oct 01, 1999
27 years ago
IPv4 Prefixes
13
85,504 addresses
IPv6 Prefixes
1
1 × /48
BGP Neighbours
3
3 upstream/peer · 0 downstream
Registration
AS Number AS13998 AS Name SWMED Organization University of Texas Southwestern Medical Center Organization ID USMCAD Address 5323 Harry Hines, Dallas, TX, 75235-8595, United States Country United States (US) Registry ARIN Allocated Oct 01, 1999 Record Created Oct 01, 1999 Last Updated Jan 29, 2013 Status
active
WHOIS Server whois.arin.net AS Description SWMED - University of Texas Southwestern Medical Center, US Abuse Email [email protected] Abuse Phone +1-214-648-0642 IPv4 Prefixes
13 prefixes · 85,504 addresses · 11 top-level Routing data as of 2026-10-07 08:00 UTC
| Prefix | Range | Addresses |
|---|---|---|
| 129.112.0.0/16 | 129.112.0.0 – 129.112.255.255 | 65,536 |
| 129.112.109.0/24 | 129.112.109.0 – 129.112.109.255 | 256 |
| 129.112.115.0/24 | 129.112.115.0 – 129.112.115.255 | 256 |
| 198.215.36.0/22 | 198.215.36.0 – 198.215.39.255 | 1,024 |
| 198.215.48.0/20 | 198.215.48.0 – 198.215.63.255 | 4,096 |
| 198.215.96.0/20 | 198.215.96.0 – 198.215.111.255 | 4,096 |
| 198.215.176.0/20 | 198.215.176.0 – 198.215.191.255 | 4,096 |
| 198.241.16.0/20 | 198.241.16.0 – 198.241.31.255 | 4,096 |
| 199.165.152.0/23 | 199.165.152.0 – 199.165.153.255 | 512 |
| 199.165.154.0/24 | 199.165.154.0 – 199.165.154.255 | 256 |
| 199.242.234.0/23 | 199.242.234.0 – 199.242.235.255 | 512 |
| 199.242.236.0/22 | 199.242.236.0 – 199.242.239.255 | 1,024 |
| 199.249.214.0/24 | 199.249.214.0 – 199.249.214.255 | 256 |
IPv6 Prefixes
1 prefix · 1 × /48 Routing data as of 2026-10-07 08:00 UTC
| Prefix | Addresses |
|---|---|
| 2620:0:840:: | 280 |
BGP Neighbours
3 unique neighbours · 3 upstream/peer · 0 downstream. A neighbour can be seen on more than one side. Rows are ordered by AS paths: the number of BGP paths seen by RIPE RIS that contain the adjacency. Sightings count each IPv4/IPv6 route with the adjacency once per RIS peer that sees it (routes × peers), so they show how widely it is seen, not how many distinct routes it carries. Networks seen to the left of this AS in BGP paths, toward the route collectors — typically its transit providers (upstreams) and peers. Upstream & peer side (3)
Raw RDAP Response
{
"endAutnum": 13998,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-05-09T08:18:01-04:00"
},
{
"eventAction": "registration",
"eventDate": "2012-03-26T16:46:28-04:00"
}
],
"handle": "USMC-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/USMC-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/13998"
},
{
"href": "https://whois.arin.net/rest/poc/USMC-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/13998"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"administrative",
"technical",
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "5323 Harry Hines Blvd.\nDallas\nTX\n75390\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"UT Southwestern Medical Center"
],
[
"org",
{},
"text",
"UT Southwestern Medical Center"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-214-648-0642"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-09-09T10:50:32-04:00"
},
{
"eventAction": "registration",
"eventDate": "1994-06-14T00:00:00-04:00"
}
],
"handle": "USMCAD",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/USMCAD",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/13998"
},
{
"href": "https://whois.arin.net/rest/org/USMCAD",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/13998"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"University of Texas Southwestern Medical Center"
],
[
"adr",
{
"label": "5323 Harry Hines\nDallas\nTX\n75235-8595\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2013-01-29T16:16:01-05:00"
},
{
"eventAction": "registration",
"eventDate": "1999-10-01T00:00:00-04:00"
}
],
"handle": "AS13998",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/13998",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/13998"
},
{
"href": "https://whois.arin.net/rest/asn/AS13998",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/13998"
}
],
"name": "SWMED",
"notices": [
{
"description": [
"By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use"
],
"links": [
{
"href": "https://www.arin.net/resources/registry/whois/tou/",
"rel": "terms-of-service",
"type": "text/html",
"value": "https://rdap.arin.net/registry/autnum/13998"
}
],
"title": "Terms of Service"
},
{
"description": [
"If you see inaccuracies in the results, please visit: "
],
"links": [
{
"href": "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/",
"rel": "inaccuracy-report",
"type": "text/html",
"value": "https://rdap.arin.net/registry/autnum/13998"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "autnum",
"port43": "whois.arin.net",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"nro_rdap_profile_asn_flat_0"
],
"startAutnum": 13998,
"status": [
"active"
]
} Contact details of private individuals are redacted.