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AS3303Swisscom (Schweiz) AG

SwitzerlandRegistryRIPE NCCTypeEyeball

As of 26th September 2026, AS3303 (Swisscom (Schweiz) AG), an access network registered in Switzerland with RIPE NCC, originates 341 IPv4 prefixes covering 8.2M addresses and 49 IPv6 prefixes. By IPv4 address space that makes it the 87th-largest of the 79,480 networks we see originating IPv4, and the largest of 739 in Switzerland. It is seen behind 67 upstream networks, most often AS2914 (NTT America, Inc.) and AS6939 (Hurricane Electric LLC), and in front of 1,203 downstream networks. 89% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 71% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

341

IPv6 prefixes

49

IPv4 addresses

8.2M

IPv6 /64s

550B

Upstream graph

The networks AS3303 is seen behind, one and two hops out, drawn from real AS paths.

AS3303Toward the internet core
Upstream graph for AS3303: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS3303Swisscom (Schweiz…This networkAS2914NTT America, Inc.AS3320Deutsche Telekom …AS3356Lumen (Level 3)AS6939Hurricane Electri…AS25091IP-Max SAAS3130RGnet OUAS49544i3D.net B.VAS13030Init7 (Switzerlan…AS37271Workonline Commun…AS18106Viewqwest Pte LtdAS20130Depaul UniversityAS8298IPng Networks GmbH

Networks observed one and two hops upstream of AS3303 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

2,561

adjacent networks

Upstreams
673%
Peers
1,29150%
Downstreams
1,20347%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 67.

Upstreams of AS3303
NetworkCountryRelationshipPathsVantage pts
AS2914NTT America, Inc.USPeer4,05643
AS6939Hurricane Electric LLCUSPeer3,06817
AS3320Deutsche Telekom AGDEPeer2,98295
AS25091IP-Max SACHPeer2,9415
AS3356Lumen (Level 3)USPeer2,69227
AS6453TATA Communications (America) IncUSPeer2,61122
AS2497Internet Initiative Japan Inc.JPPeer2,5285
AS3491PCCW Global (HK) Ltd.HKPeer2,48412
AS3257GTT Communications Inc.USPeer2,46319
AS11164Internet2 I2PXUSPeer2,4131

Prefixes

All 390

The largest blocks AS3303 originates, widest first.

Largest prefixes originated by AS3303
PrefixAddressesVisibility
85.0.0.0/13524k80/81
178.192.0.0/13524k80/81
83.76.0.0/14262k81/81
85.0.0.0/14262k19/81
85.4.0.0/14262k19/81
92.104.0.0/14262k81/81
178.192.0.0/14262k19/81
178.196.0.0/14262k19/81
188.60.0.0/14262k81/81
62.202.0.0/15131k81/81

Routing health

How AS3303'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

  • Valid89.2%348
  • Invalid0.0%0
  • No ROA10.8%42

Propagation

  • Globally propagated90% of full-feed peers or more70.5%275
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%29.5%115

Prefix sizes

IPv4 — 341 prefixes

IPv6 — 49 prefixes

  • /27137B × /642.0%1
  • /2868.7B × /644.1%2
  • /2934.4B × /6410.2%5
  • /3017.2B × /644.1%2
  • /318.6B × /648.2%4
  • /324.3B × /6414.3%7
  • /332.1B × /642.0%1
  • /341.1B × /644.1%2
  • /36268M × /642.0%1
  • /3867.1M × /642.0%1
  • /4865.5k × /6446.9%23

Recent changes

Announcements that started or stopped since 27th Aug 2026.

  • Announced193.134.32.0/2322nd Sept 2026
  • Announced195.65.27.0/2422nd Sept 2026
  • Withdrawn185.176.236.0/2221st Sept 2026
  • Withdrawn193.135.219.0/2421st Sept 2026
  • Withdrawn91.220.40.0/2421st Sept 2026
  • Withdrawn91.220.99.0/2421st Sept 2026

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