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AS18University of Texas at Austin

United StatesRegistryARIN

As of 23rd October 2026, AS18 (University of Texas at Austin), a network registered in the United States with ARIN, originates 8 IPv4 prefixes covering 300k addresses. By IPv4 address space that makes it the 976th-largest of the 79,652 networks we see originating IPv4, and the 251st-largest of 18,475 in the United States. It is seen behind 3 upstream networks, most often AS174 (Cogent Communications, LLC) and AS6922 (Texas Department of Information…). 13% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

8

IPv6 prefixes

0

IPv4 addresses

300k

IPv6 /64s

0

Upstream graph

The networks AS18 is seen behind, one and two hops out, drawn from real AS paths.

AS18Toward the internet core
Upstream graph for AS18: 8 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS18University of Tex…This networkAS174Cogent Communicat…AS276University of Tex…AS6922Texas Department …AS151326DCConnect Communi…AS1299Arelion (fka. Tel…AS14085LEARNAS16905LEARNAS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS18 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

7

adjacent networks

Upstreams
343%
Peers
457%
Downstreams
00%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS18
NetworkCountryRelationshipPathsVantage pts
AS174Cogent Communications, LLCUSPeer37470
AS6922Texas Department of Information ResourcesUSPeer22176
AS276University of Texas SystemUSPeer142

Prefixes

The largest blocks AS18 originates, widest first.

Largest prefixes originated by AS18
PrefixAddressesVisibility
128.62.0.0/1665.5k76/77
128.83.0.0/1665.5k76/77
129.116.0.0/1665.5k76/77
146.6.0.0/1665.5k76/77
198.213.192.0/1816.4k76/77
206.76.64.0/1816.4k76/77
198.214.80.0/204.1k76/77
198.214.250.0/2351277/77

Routing health

How AS18's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid12.5%1
  • Invalid0.0%0
  • No ROA87.5%7

Propagation

  • Globally propagated90% of full-feed peers or more100.0%8
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 8 prefixes

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS18 started or stopped in this period.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.