AS14255 — AS-USD

AS14255 announces 6 IPv4 prefixes covering 1,538 addresses and 1 IPv6 prefixes.

About this network

A single /24 announced as eight separate pieces, alongside a /31 and a /123.

What it's used for

• A university's network. 1,538 addresses across fourteen IPv4 prefixes, with two observed BGP neighbours.

Notable

• 192.195.154.0 is split into announcements at /25, /26, /27, /28, /29, /30 and two at /31, each carrying the netname USD.
• 137.164.41.104/31 is registered to CENIC under the netname CALREN.
• The IPv6 announcement is a /123, covering thirty-two addresses.
• Two of eighteen sampled addresses answered, as mymobilelb.sandiego.edu and banprodxe.sandiego.edu.

Interesting

• Splitting one block into eight is the most extreme deaggregation in this range, and the sizes step down by half each time in the pattern a tool produces when told to cover a range exactly. Most networks filter announcements smaller than a /24, so almost none of this reaches the wider internet.
• The /31 is a point-to-point link to the regional research network, and the /123 is a similarly tiny slice of IPv6. Neither is meant to travel; both are visible because the collector that built this inventory sees more than a distant router would.
• One published name marks a production instance of the university's administrative system. Naming a student records host in public DNS tells an outsider what to aim at.
• Two neighbours for a university means transit arrives through the research network rather than from commercial carriers.

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

Announced prefixes

• 137.164.41.104/31
• 192.55.87.0/24
• 192.195.153.0/24
• 192.195.154.0/23
• 208.71.25.0/24
• 208.71.27.0/24
• 2607:f380:1::118:9a42:9680/123

Upstream networks

• AS2152 CENIC
• AS22773 Cox Communications Inc.

Adjacent networks

• AS2152 CENIC
• AS22773 Cox Communications Inc.

Routing security

• RPKI: 0 valid, 0 invalid and 6 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 8 route objects.
• Listed in as-sets: AS-CALREN2, AS-COX-CALIFORNIA.