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AS160The University of Chicago

United StatesRegistryARIN

As of 22nd October 2026, AS160 (The University of Chicago), a network registered in the United States with ARIN, originates 6 IPv4 prefixes covering 115k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 2,192nd-largest of the 79,655 networks we see originating IPv4, and the 701st-largest of 18,475 in the United States. It is seen behind 6 upstream networks, most often AS6461 (Zayo Bandwidth) and AS174 (Cogent Communications, LLC). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 88% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

6

IPv6 prefixes

2

IPv4 addresses

115k

IPv6 /64s

131k

Upstream graph

The networks AS160 is seen behind, one and two hops out, drawn from real AS paths.

AS160Toward the internet core
Upstream graph for AS160: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS160The University of…This networkAS174Cogent Communicat…AS293ESnetAS6461Zayo BandwidthAS11164Internet2 I2PXAS11537Internet2AS1299Arelion (fka. Tel…AS151326DCConnect Communi…AS6939Hurricane Electri…AS2914NTT America, Inc.AS32590Valve CorporationAS2152CENIC - CalRENAS2497Internet Initiati…

Networks observed one and two hops upstream of AS160 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

15

adjacent networks

Upstreams
640%
Peers
960%
Downstreams
00%

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

Upstreams of AS160
NetworkCountryRelationshipPathsVantage pts
AS6461Zayo BandwidthUSPeer20560
AS174Cogent Communications, LLCUSPeer17768
AS11164Internet2 I2PXUSPeer14651
AS293ESnetUSPeer51
AS11537Internet2USPeer41
AS2153CENICUSPeer11

Prefixes

The largest blocks AS160 originates, widest first.

Largest prefixes originated by AS160
PrefixAddressesVisibility
128.135.0.0/1665.5k76/77
205.208.0.0/1732.8k76/77
192.170.192.0/198.2k76/77
192.170.224.0/198.2k76/77
192.5.85.0/2425676/77
198.177.153.0/2425634/77
2605:9a00::/4865.5k × /6462/64
2605:9a00:10::/4865.5k × /6462/64

Routing health

How AS160'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

  • Valid100.0%8
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more87.5%7
  • Partially propagated40% to 90%12.5%1
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 6 prefixes

IPv6 — 2 prefixes

  • /4865.5k × /64100.0%2

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

No announcement by AS160 started or stopped in this period.

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