subnet.im

AS2152CENIC - CalREN

United StatesRegistryARINTypeEyeball

As of 26th September 2026, AS2152 (CENIC - CalREN), an access network registered in the United States with ARIN, originates 733 IPv4 prefixes covering 2.5M addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 231st-largest of the 79,480 networks we see originating IPv4, and the 58th-largest of 18,421 in the United States. It is seen behind 8 upstream networks, most often AS3356 (Lumen (Level 3)) and AS6939 (Hurricane Electric LLC), and in front of 150 downstream networks. 4% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 22% 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

733

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: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS2152CENIC - CalRENThis networkAS2153CENICAS3356Lumen (Level 3)AS6461Zayo BandwidthAS6939Hurricane Electri…AS11164Internet2 I2PXAS293ESnetAS3549Lumen (fka. Globa…AS2914NTT America, Inc.AS32590Valve CorporationAS18106Viewqwest Pte LtdAS20130Depaul UniversityAS2497Internet 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

314

adjacent networks

Upstreams
83%
Peers
15650%
Downstreams
15048%

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

Upstreams of AS2152
NetworkCountryRelationshipPathsVantage pts
AS3356Lumen (Level 3)USPeer69,64180
AS6939Hurricane Electric LLCUSPeer9,70875
AS11164Internet2 I2PXUSPeer5,56546
AS6461Zayo BandwidthUSPeer3,15025
AS2153CENICUSPeer1,7941
AS49544i3D.net B.VNLPeer1,4412
AS396450Internet2USPeer23579
AS8220COLTGBPeer722

Prefixes

All 734

The largest blocks AS2152 originates, widest first.

Largest prefixes originated by AS2152
PrefixAddressesVisibility
130.65.0.0/1665.5k81/81
130.150.0.0/1665.5k81/81
130.157.0.0/1665.5k81/81
130.166.0.0/1665.5k81/81
130.182.0.0/1665.5k81/81
130.191.0.0/1665.5k81/81
130.212.0.0/1665.5k81/81
132.241.0.0/1665.5k81/81
134.139.0.0/1665.5k81/81
134.154.0.0/1665.5k81/81

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

  • Valid3.5%26
  • Invalid0.0%0
  • No ROA96.5%708

Propagation

  • Globally propagated90% of full-feed peers or more21.9%161
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%78.1%573

Prefix sizes

IPv4 — 733 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 27th Aug 2026.

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