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AS2152CENIC - CalREN

United StatesRegistryARINTypeEyeball

As of 10th November 2026, AS2152 (CENIC - CalREN), an access network registered in the United States with ARIN, originates 754 IPv4 prefixes covering 2.5M addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 233rd-largest of the 80,723 networks we see originating IPv4, and the 58th-largest of 18,750 in the United States. It is seen behind 7 upstream networks, most often AS3356 (Lumen (Level 3)) and AS6939 (Hurricane Electric LLC), and in front of 150 downstream networks. 3% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 21% of its routes reach at least 90% of full-feed peers, and 1 prefix is also originated by another network.

At a glance

IPv4 prefixes

754

IPv6 prefixes

1

IPv4 addresses

2.5M

IPv6 /64s

4.3B

Upstream graph

The networks AS2152 is seen behind, one and two hops out, drawn from real AS paths.

AS2152Toward the internet core
Upstream graph for AS2152: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS2152CENIC - CalRENThis networkAS2153CENICAS3356Lumen (Level 3)AS6939Hurricane Electri…AS11164Internet2 I2PXAS49544i3D.net B.VAS293ESnetAS3549Lumen (fka. Globa…AS20130Depaul UniversityAS132337AxclusiveAS2914NTT America, Inc.AS2497Internet Initiati…

Networks observed one and two hops upstream of AS2152 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

312

adjacent networks

Upstreams
72%
Peers
15550%
Downstreams
15048%

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

Upstreams of AS2152
NetworkCountryRelationshipPathsVantage pts
AS3356Lumen (Level 3)USPeer65,70675
AS6939Hurricane Electric LLCUSPeer9,73972
AS11164Internet2 I2PXUSPeer5,53544
AS2153CENICUSPeer1,9621
AS49544i3D.net B.VNLPeer1,4622
AS6461Zayo BandwidthUSPeer1,08817
AS396450Internet2USPeer27675

Prefixes

All 755

The largest blocks AS2152 originates, widest first.

Largest prefixes originated by AS2152
PrefixAddressesVisibility
130.65.0.0/1665.5k76/76
130.150.0.0/1665.5k76/76
130.157.0.0/1665.5k76/76
130.166.0.0/1665.5k76/76
130.182.0.0/1665.5k76/76
130.191.0.0/1665.5k76/76
130.212.0.0/1665.5k76/76
132.241.0.0/1665.5k76/76
134.139.0.0/1665.5k76/76
134.154.0.0/1665.5k76/76

Routing health

How AS2152'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

  • Valid3.4%26
  • Invalid0.0%0
  • No ROA96.6%729

Propagation

  • Globally propagated90% of full-feed peers or more20.7%156
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%79.3%599

Prefix sizes

IPv4 — 754 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 11th Oct 2026.

24 announced and 5 withdrawn in all; the most recent are shown.

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