subnet.im

AS513CERN

SwitzerlandRegistryRIPE NCC

As of 10th November 2026, AS513 (CERN), a network registered in Switzerland with RIPE NCC, originates 20 IPv4 prefixes covering 355k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 882nd-largest of the 80,723 networks we see originating IPv4, and the 6th-largest of 746 in Switzerland. It is seen behind 8 upstream networks, most often AS25091 (IP-Max SA) and AS21320 (GEANT Vereniging), and in front of 6 downstream networks. Every one of its announcements has 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

20

IPv6 prefixes

2

IPv4 addresses

355k

IPv6 /64s

8.6B

Upstream graph

The networks AS513 is seen behind, one and two hops out, drawn from real AS paths.

AS513Toward the internet core
Upstream graph for AS513: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS513CERNThis networkAS174Cogent Communicat…AS6939Hurricane Electri…AS21320GEANT VerenigingAS25091IP-Max SAAS29222Infomaniak Networ…AS151326DCConnect Communi…AS20130Depaul UniversityAS1299Arelion (fka. Tel…AS2603NORDUnetAS3356Lumen (Level 3)AS8298IPng Networks GmbHAS56662Marcin Gondek

Networks observed one and two hops upstream of AS513 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

67

adjacent networks

Upstreams
812%
Peers
5379%
Downstreams
69%

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

Upstreams of AS513
NetworkCountryRelationshipPathsVantage pts
AS25091IP-Max SACHPeer81098
AS21320GEANT VerenigingNLPeer64547
AS174Cogent Communications, LLCUSPeer23419
AS29222Infomaniak Network SACHPeer13258
AS6939Hurricane Electric LLCUSPeer8310
AS13030Init7 (Switzerland) Ltd.CHPeer544
AS6730Sunrise GmbHCHPeer513
AS293ESnetUSPeer331

Prefixes

The largest blocks AS513 originates, widest first.

Largest prefixes originated by AS513
PrefixAddressesVisibility
128.141.0.0/1665.5k74/76
128.142.0.0/1665.5k74/76
137.138.0.0/1665.5k74/76
188.184.0.0/1665.5k74/76
188.185.0.0/1665.5k74/76
194.12.128.0/1816.4k74/76
192.65.184.0/212k74/76
185.249.56.0/221k74/76
192.16.156.0/221k74/76
192.16.160.0/221k74/76

Routing health

How AS513'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%22
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%22
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 20 prefixes

IPv6 — 2 prefixes

  • /324.3B × /64100.0%2

Recent changes

Announcements that started or stopped since 11th Oct 2026.

No announcement by AS513 started or stopped in this period.

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