Registration
IPv4 Prefixes
16 prefixes · 75,264 addresses · 9 top-level Routing data as of 2026-10-07 08:00 UTC
| Prefix | Range | Addresses |
|---|---|---|
| 104.128.208.0/20 | 104.128.208.0 – 104.128.223.255 | 4,096 |
| 147.72.249.0/24 | 147.72.249.0 – 147.72.249.255 | 256 |
| 147.73.0.0/16 | 147.73.0.0 – 147.73.255.255 | 65,536 |
| 147.73.0.0/24 | 147.73.0.0 – 147.73.0.255 | 256 |
| 147.73.3.0/24 | 147.73.3.0 – 147.73.3.255 | 256 |
| 147.73.4.0/24 | 147.73.4.0 – 147.73.4.255 | 256 |
| 147.73.6.0/24 | 147.73.6.0 – 147.73.6.255 | 256 |
| 147.73.7.0/24 | 147.73.7.0 – 147.73.7.255 | 256 |
| 147.73.8.0/24 | 147.73.8.0 – 147.73.8.255 | 256 |
| 147.73.16.0/20 | 147.73.16.0 – 147.73.31.255 | 4,096 |
| 167.88.240.0/20 | 167.88.240.0 – 167.88.255.255 | 4,096 |
| 192.70.222.0/24 | 192.70.222.0 – 192.70.222.255 | 256 |
| 192.88.114.0/24 | 192.88.114.0 – 192.88.114.255 | 256 |
| 192.88.115.0/24 | 192.88.115.0 – 192.88.115.255 | 256 |
| 192.112.102.0/24 | 192.112.102.0 – 192.112.102.255 | 256 |
| 192.231.244.0/24 | 192.231.244.0 – 192.231.244.255 | 256 |
IPv6 Prefixes
2 prefixes · 65,537 × /48 Routing data as of 2026-10-07 08:00 UTC
| Prefix | Addresses |
|---|---|
| 2001:5e8:: | 296 |
| 2620:72:4000:: | 280 |
BGP Neighbours
22 unique neighbours · 7 upstream/peer · 14 downstream · 1 collector-only. 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. Networks seen to the right of this AS in BGP paths — networks whose routes it carries, typically its customers (downstreams). Networks seen to the left of this AS only when they peer directly with a RIPE RIS route collector, so the adjacency may be an artefact of that peering; many of them also appear on the downstream side. Upstream & peer side (7)
AS Name AS paths IPv4 sightings IPv6 sightings AS174 COGENT-174 - Cogent Communications, LLC 1,345 6,018 368 AS6939 HURRICANE - Hurricane Electric LLC 705 1,021 750 AS3356 LEVEL3 - Level 3 Parent, LLC 438 1,149 91 AS11164 INTERNET2-I2PX - Internet2 352 1,401 199 AS11537 INTERNET2-RESEARCH-EDU - Internet2 95 332 18 AS293 ESNET - ESnet 19 55 6 AS20326 TERASWITCH - TeraSwitch Networks Inc. 4 2 3 Downstream side (14)
AS Name AS paths IPv4 sightings IPv6 sightings AS7925 WVNET - West Virginia Network for Educational Telecomputing 298 1,016 0 AS36407 CERT - Software Engineering Institute 273 238 330 AS1206 PSCNET-HS-AS - Pittsburgh Supercomputing Center 264 1,001 0 AS23102 RMU-EDU - Robert Morris University 258 670 0 AS1207 PSCNET-HS-TEST-AS - Pittsburgh Supercomputing Center 257 1,003 0 AS19281 QUAD9-AS-1 - Quad9 252 331 1 AS18572 BVIU27 - Beaver Valley Intermediate Unit #27 164 16 210 AS4130 UPITT-AS - University of Pittsburgh 130 44 183 AS9 CMU-ROUTER - Carnegie Mellon University 58 42 56 AS3783 AIU-ALLEGHENY-CONNECT-RWAN - Allegheny Intermediate Unit 54 188 9 AS63472 EINETWORK - eiNetwork 36 40 0 AS11009 CARLOWUNIV - Carlow University 33 39 0 AS27604 SETONHILLUNIVERSITY - Seton Hill University 27 31 0 AS12118 WVU - West Virginia University 12 70 0 Collector-only (1)
AS Name AS paths IPv4 sightings IPv6 sightings AS19151 BBO-1 - BroadbandONE, LLC 17 96 17
Raw RDAP Response
{
"endAutnum": 5050,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-11-20T10:12:05-05:00"
},
{
"eventAction": "registration",
"eventDate": "1999-05-19T16:13:17-04:00"
}
],
"handle": "PN-ORG-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/PN-ORG-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/5050"
},
{
"href": "https://whois.arin.net/rest/poc/PN-ORG-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/5050"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical",
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "300 S Craig St\nPittsburgh\nPA\n15213\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Pittsburgh Supercomputing Center"
],
[
"org",
{},
"text",
"Pittsburgh Supercomputing Center"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-412-268-4960"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-11-20T14:40:29-05:00"
}
],
"handle": "ML1385-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/ML1385-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/5050"
},
{
"href": "https://whois.arin.net/rest/poc/ML1385-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/5050"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"administrative"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-03-01T18:15:43-05:00"
}
],
"handle": "SC274-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/SC274-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/5050"
},
{
"href": "https://whois.arin.net/rest/poc/SC274-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/5050"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"abuse",
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "Pittsburgh Supercomputing Center\r\n300 S. Craig St.\nPittsburgh\nPA\n15213\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Stephen Cunningham"
],
[
"n",
{},
"text",
[
"Cunningham",
"Stephen",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-412-268-4960"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2022-04-27T16:39:11-04:00"
},
{
"eventAction": "registration",
"eventDate": "2008-05-29T07:34:51-04:00"
}
],
"handle": "PSC-Z",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/PSC-Z",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/5050"
},
{
"href": "https://whois.arin.net/rest/org/PSC-Z",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/5050"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"Pittsburgh Supercomputing Center"
],
[
"adr",
{
"label": "300 S Craig St\nPittsburgh\nPA\n15213\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-11-20T10:12:05-05:00"
},
{
"eventAction": "registration",
"eventDate": "1999-05-19T16:13:17-04:00"
}
],
"handle": "PN-ORG-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/PN-ORG-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/5050"
},
{
"href": "https://whois.arin.net/rest/poc/PN-ORG-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/5050"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "300 S Craig St\nPittsburgh\nPA\n15213\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Pittsburgh Supercomputing Center"
],
[
"org",
{},
"text",
"Pittsburgh Supercomputing Center"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-412-268-4960"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2012-04-02T10:31:36-04:00"
},
{
"eventAction": "registration",
"eventDate": "1995-03-29T00:00:00-05:00"
}
],
"handle": "AS5050",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/5050",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/5050"
},
{
"href": "https://whois.arin.net/rest/asn/AS5050",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/5050"
}
],
"name": "PSC-EXT",
"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/5050"
}
],
"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/5050"
}
],
"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": 5050,
"status": [
"active"
]
} Contact details of private individuals are redacted.