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AS3303Swisscom (Schweiz) AG

SwitzerlandRegistryRIPE NCCTypeEyeball

As of 10th November 2026, AS3303 (Swisscom (Schweiz) AG), an access network registered in Switzerland with RIPE NCC, originates 343 IPv4 prefixes covering 8.2M addresses and 49 IPv6 prefixes. By IPv4 address space that makes it the 89th-largest of the 80,723 networks we see originating IPv4, and the largest of 746 in Switzerland. It is seen behind 63 upstream networks, most often AS2914 (NTT America, Inc.) and AS25091 (IP-Max SA), and in front of 1,220 downstream networks. 90% of its announcements have a valid RPKI ROA; 1 is RPKI-invalid. 70% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

343

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 SAAS49544i3D.net B.VAS215859Hetzner Cloud - S…AS13030Init7 (Switzerlan…AS20130Depaul UniversityAS132337AxclusiveAS8298IPng Networks GmbHAS56662Marcin Gondek

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

2,594

adjacent networks

Upstreams
632%
Peers
1,31151%
Downstreams
1,22047%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 63.

Upstreams of AS3303
NetworkCountryRelationshipPathsVantage pts
AS2914NTT America, Inc.USPeer3,81041
AS25091IP-Max SACHPeer3,1065
AS6939Hurricane Electric LLCUSPeer3,08916
AS3320Deutsche Telekom AGDEPeer3,05890
AS3356Lumen (Level 3)USPeer2,87027
AS2497Internet Initiative Japan Inc.JPPeer2,7605
AS11164Internet2 I2PXUSPeer2,4031
AS6453TATA Communications (America) IncUSPeer2,27420
AS3491PCCW Global (HK) Ltd.HKPeer2,21912
AS37271Workonline Communications(Pty) LtdZAPeer2,0952

Prefixes

All 392

The largest blocks AS3303 originates, widest first.

Largest prefixes originated by AS3303
PrefixAddressesVisibility
85.0.0.0/13524k75/76
178.192.0.0/13524k75/76
83.76.0.0/14262k76/76
85.0.0.0/14262k17/76
85.4.0.0/14262k17/76
92.104.0.0/14262k76/76
178.192.0.0/14262k17/76
178.196.0.0/14262k17/76
188.60.0.0/14262k76/76
62.202.0.0/15131k76/76

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

  • Valid89.5%351
  • Invalid0.3%1
  • No ROA10.2%40

Propagation

  • Globally propagated90% of full-feed peers or more70.4%276
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%29.6%116

Prefix sizes

IPv4 — 343 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 11th Oct 2026.

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