Interconnection

AS21320 GEANT_IAS_VRF

Unclassified RIPE

Exchanges 17 17 active

Countries 17 most in Austria

Regions 1

Largest fabric 1,078 DE-CIX Frankfurt

Recorded presence

Internet exchanges

recorded

Internet exchanges where Packet Clearing House has a port recorded for AS21320, largest fabric first. An exchange is shared switching where networks interconnect directly rather than paying a transit provider, so turning up at one is a deliberate choice about how this network wants to be reached. Each name opens that exchange's page, with its peering LANs and everyone else on it.

Europe 17

Exchange	Location	Their address	Policy	Member ports
DE-CIX Frankfurt	Frankfurt, Germany	80.81.192.173	Selective	1,078
LINX LON1	London, United Kingdom	195.66.226.161	Selective	932
AMS-IX Amsterdam	Amsterdam, Netherlands	80.249.210.137	Case-by-case	882
Milan Internet Exchange	Milan, Italy	217.29.66.183	—	418
DE-CIX Madrid	Madrid, Spain	185.1.192.126	Selective	227
NIX.CZ - Neutral Internet eXchange for the Czech Republic	Prague, Czech Republic	91.210.16.189	Selective	208
Vienna Internet Exchange	Vienna, Austria	193.203.0.172	Selective	187
Bulgarian Internet eXchange	Sofia, Bulgaria	193.169.199.145	Selective	139
Budapest Internet Exchange	Budapest, Hungary	193.188.137.37	Selective	120
Internet Neutral Exchange Association CLG - LAN1	Dublin, Ireland	185.6.36.108	Selective	116
DE-CIX Marseille	Marseille, France	185.1.47.34	Selective	113
Luxembourg Internet Exchange	Luxembourg, Luxembourg	188.93.170.110	Selective	103
Belgian National Internet Exchange	Brussels, Belgium	194.53.172.37	Selective	83
Greek Internet Exchange - Athens	Athens, Greece	176.126.38.4	Selective	75
Gigabit Portuguese Internet Exchange Point	Lisbon, Portugal	193.136.250.36	Selective	63
CERN IXP / Equinix Internet Exchange Geneva	Geneva, Switzerland	192.65.185.119	Selective	55
Slovenian Internet Exchange	Ljubljana, Slovenia	91.220.194.45	Open	39

Recorded rather than inferred: an address on a peering LAN is at that exchange by definition. Member ports counts every participant at the exchange, not this network's ports, so read it as a size proxy. An absent exchange means PCH has no record of it, not that the network is not there. For the operator's own claims, see its PeeringDB record.

From the exchange directory collected 2026-10-11 by Packet Clearing House (https://www.pch.net/ixp/data), covering 1,346 exchanges and 98,138 recorded member ports, licensed CC BY-NC-SA 3.0.

PeeringDB is the better-known directory and is deliberately not the source here: its acceptable-use policy forbids the bulk storage this needs. The two answer different questions anyway. PeeringDB reports what an operator declares about itself; this reports what PCH has recorded.