AS7377 — UCSD

Network type: education

AS7377 announces 782 IPv4 prefixes covering 12,131,082 addresses and 25 IPv6 prefixes.

About this network

UCSD is the University of California, San Diego, a major public research university and the home of the San Diego Supercomputer Center. AS7377 is its campus network.

What it's used for

• Campus connectivity for students, staff, labs and research groups across four legacy Class B blocks: 128.54.0.0/16, 132.239.0.0/16, 137.110.0.0/16 and 169.228.0.0/16, plus an IPv6 2607:f720::/32.
• Reverse DNS is institutional throughout, with names like agg-vss-1-vlan2-gw.ucsd.edu for campus aggregation routers and per-department zones such as sysnet.ucsd.edu for the computer-science research groups. There is no subscriber-style addressing anywhere.

Notable

• This is university address space, not consumer or commercial space. Traffic from it is far more likely to be a lab machine, a research measurement host, or a student on campus Wi-Fi than a home broadband user.
• ARIN registered the ASN in November 1996. The -Z suffix on the university's org handle is an ARIN legacy-cleanup artefact, not a sign the number changed hands.

Interesting

• AS7377 announces 44.0.0.0/9 and 44.128.0.0/10: the AMPRNet amateur-radio address space, held by Amateur Radio Digital Communications (ARDC). ARDC's internet gateway has long been hosted at UCSD as part of a research project, so the university's AS carries an enormous block of addresses that belong to the worldwide ham-radio community rather than to the campus.
• Those two blocks account for the great majority of the IPv4 addresses attributed to this ASN. Its actual campus footprint is roughly a quarter of a million addresses.

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

Announced prefixes

• 44.0.0.0/16
• 44.1.0.0/24
• 44.1.4.0/22
• 44.1.9.0/24
• 44.1.10.0/23
• 44.1.12.0/22
• 44.1.16.0/20
• 44.1.32.0/19
• 44.1.64.0/18
• 44.1.128.0/17
• 44.2.0.0/20
• 44.2.16.0/23
• 44.2.19.0/24
• 44.2.20.0/22
• 44.2.24.0/21
• 44.2.32.0/20
• 44.2.48.0/22
• 44.2.54.0/23
• 44.2.56.0/21
• 44.2.64.0/18
• 44.2.128.0/17
• 44.3.128.0/17
• 44.4.0.0/20
• 44.4.16.0/24
• 44.4.18.0/23
• 44.4.20.0/22
• 44.4.24.0/21
• 44.4.32.0/21
• 44.4.40.0/24
• 44.4.42.0/23
• 44.4.46.0/23
• 44.4.48.0/23
• 44.4.50.0/24
• 44.4.52.0/24
• 44.4.54.0/23
• 44.4.56.0/24
• 44.4.60.0/22
• 44.4.68.0/22
• 44.4.72.0/21
• 44.4.80.0/20
• 44.4.96.0/19
• 44.4.132.0/22
• 44.4.136.0/21
• 44.4.144.0/20
• 44.4.160.0/19
• 44.4.192.0/18
• 44.6.0.0/17
• 44.6.129.0/24
• 44.6.130.0/23
• 44.6.132.0/22
• 44.6.136.0/21
• 44.6.144.0/20
• 44.6.160.0/19
• 44.6.192.0/18
• 44.7.16.0/20
• 44.7.32.0/19
• 44.7.64.0/18
• 44.7.128.0/17
• 44.8.0.0/22
• 44.8.4.0/24
• 44.8.6.0/23
• 44.8.8.0/21
• 44.8.16.0/20
• 44.8.32.0/19
• 44.8.64.0/18
• 44.8.128.0/17
• 44.9.24.0/21
• 44.9.32.0/19
• 44.9.64.0/18
• 44.9.128.0/17
• 44.10.0.0/22
• 44.10.5.0/24
• 44.10.6.0/23
• 44.10.8.0/23
• 44.10.11.0/24
• 44.10.12.0/22
• 44.10.16.0/20
• 44.10.32.0/19
• 44.10.64.0/18
• 44.10.128.0/17
• 44.12.0.0/22
• 44.12.4.0/23
• 44.12.8.0/24
• 44.12.10.0/23
• 44.12.12.0/23
• 44.12.15.0/24
• 44.12.16.0/20
• 44.12.32.0/20
• 44.12.49.0/24
• 44.12.50.0/23
• 44.12.52.0/22
• 44.12.56.0/21
• 44.12.64.0/19
• 44.12.100.0/22
• 44.12.104.0/21
• 44.12.112.0/20
• 44.12.128.0/17
• 44.13.0.0/16
• 44.14.0.0/16
• 44.15.128.0/18

and 707 more.

Upstream networks

• AS2152 CENIC
• AS2153 CENIC

Downstream networks

• AS26397 The Regents of the University of California - University of California, San Diego.

Adjacent networks

• AS2152 CENIC
• AS2153 CENIC
• AS26397 The Regents of the University of California - University of California, San Diego.