AS55 — UPENN

AS55 announces 11 IPv4 prefixes covering 261,888 addresses and 15 IPv6 prefixes.

About this network

An early low-numbered allocation (UPENN) serving the University of Pennsylvania in Philadelphia.

What it's used for

• Campus, research, and administrative networking for Penn and its schools.

Notable

• Institutional address space, not commercial hosting.
• A two-digit AS number places Penn among the internet's earliest participants.

Interesting

• ENIAC, one of the first general-purpose electronic computers, was built at the University of Pennsylvania in the 1940s.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 128.91.0.0/16
• 130.91.0.0/16
• 158.130.0.0/16
• 165.123.0.0/17
• 165.123.128.0/18
• 165.123.194.0/23
• 165.123.196.0/22
• 165.123.200.0/21
• 165.123.208.0/20
• 165.123.224.0/19
• 192.84.2.0/24
• 2607:f470::/33
• 2607:f470:5001::/48
• 2607:f470:5002::/47
• 2607:f470:5004::/46
• 2607:f470:5008::/45
• 2607:f470:5010::/44
• 2607:f470:5020::/43
• 2607:f470:5040::/42
• 2607:f470:5080::/41
• 2607:f470:5100::/40
• 2607:f470:5200::/39
• 2607:f470:5400::/38
• 2607:f470:5800::/37
• 2607:f470:6000::/35
• 2607:f470:8000::/33

Upstream networks

• AS3356 Level 3 Parent, LLC
• AS174 Cogent Communications, LLC
• AS11164 Internet2
• AS11537 Internet2

Downstream networks

• AS69 University of Pennsylvania
• AS46274 Penn Medicine

Adjacent networks

• AS3356 Level 3 Parent, LLC
• AS174 Cogent Communications, LLC
• AS11164 Internet2
• AS69 University of Pennsylvania
• AS11537 Internet2
• AS46274 Penn Medicine