Autonomous System
AS55 University of Pennsylvania
EducationActiveUnited StatesARIN
AS55 (UPENN) is an education network operated by University of Pennsylvania in United States, registered with ARIN. It has 5 IPv4 prefixes with 262,400 addresses and 1 IPv6 prefix, which makes it the 1,064th largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses262,400in 5 prefixes
IPv6 prefixes1≈ 7.9 × 10²⁸ addresses
Size rank#1,064of 82,200 active ASNs
Details
OrganizationUniversity of Pennsylvania
AS nameUPENN
Websiteupenn.edu
Country United States (US)
Network typeEducation
RegistryARIN
Abuse contactsecurity@upenn.edu
Registered1985-12-18
Last updated2021-10-14
IPv4 prefixes
5 prefixes · 262,400 addresses| Network | Addresses | First – last address |
|---|---|---|
| 128.91.0.0/16 | 65,536 | 128.91.0.0 – 128.91.255.255 |
| 130.91.0.0/16 | 65,536 | 130.91.0.0 – 130.91.255.255 |
| 158.130.0.0/16 | 65,536 | 158.130.0.0 – 158.130.255.255 |
| 165.123.0.0/16 | 65,536 | 165.123.0.0 – 165.123.255.255 |
| 192.84.2.0/24 | 256 | 192.84.2.0 – 192.84.2.255 |
128.91.0.0/16 130.91.0.0/16 158.130.0.0/16 165.123.0.0/16 192.84.2.0/24
IPv6 prefixes
1 prefix- 2607:f470::/32
2607:f470::/32
Query AS55 with the API
The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day.
curl "https://api.ipapi.is/?q=AS55&key=YOUR_API_KEY"Any address in its prefixes resolves to AS55, with or without a key:
curl "https://api.ipapi.is/?q=128.91.0.1"Largest networks in United States
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