Copenhagen · Denmark
PeeringDB records five internet exchanges in Copenhagen. DIX, the Danish Internet Exchange, is the best connected with 28 participants, ahead of STHIX - Copenhagen with 19 and DE-CIX Copenhagen with 11. Seven colocation facilities hold 123 network presences between them. A Copenhagen IP address tells you where an operator registered the block, not where a device sits.
Internet exchanges in Copenhagen
An exchange is a shared switch where networks hand traffic to each other directly. Participant counts come from PeeringDB, where each network maintains its own record.
| Exchange | Participants | Registry carriers peering |
|---|---|---|
DIX Danish Internet Exchange | 28 | |
STHIX - Copenhagen | 19 | |
DE-CIX Copenhagen | 11 | |
NorthIX | 11 | none in the registry |
LabIX Labitat Internet Exchange | 4 | none in the registry |
Exchange records: PeeringDB.
Colocation facilities
Buildings where networks put equipment. The network count is how many PeeringDB members list a presence there, which shows where capacity in the city sits.
| Facility | Networks present | Address |
|---|---|---|
| Digital Realty Copenhagen CPH1-3 | 98 | Industriparken 20A Ballerup |
| Telia Telehouse Copenhagen | 18 | Sydvestvej 100 Glostrup |
| Cibicom Datacenter CPH West | 2 | Overdrevsvej 12 Smørum |
| GlobalConnect Vesterbro (CPH2) | 2 | Vesterbrogade 149 |
| Siminn Hosting | 1 | Aarhusgade 88 Østerbro |
| Templus DC Copenhagen CPH01 | 1 | Borgmester Christiansens Gade 55 |
| Vaultica Data Centers | COP01 | 1 | Holmbladsgade 142 |
What a Copenhagen IP address tells you
Copenhagen has five exchanges in the registry, and no single one holds the city. DIX has the most with 28 participants, STHIX - Copenhagen has 19, DE-CIX Copenhagen and NorthIX have 11 each, and LabIX has 4. More network presence sits in colocation than on those fabrics, because the seven recorded facilities hold 123 networks and Digital Realty Copenhagen CPH1-3 alone accounts for 98 of them. Of the Danish mobile operators, 3 (AS44034) peers at both DIX and STHIX - Copenhagen, and TDC (AS3292) at DE-CIX Copenhagen. Telenor and Telia mobile ASNs are not recorded at any Copenhagen exchange.
An address that geolocates to Copenhagen is often not a device in Copenhagen. Operators announce address blocks from a registry record, and that record carries one address for a whole allocation that may serve customers across Denmark. Mobile traffic is stronger evidence of a gateway than of a location, since a carrier hands subscriber sessions to the internet through a small number of exit points and the same city can appear behind every session on the network. Geolocation databases then copy the operator's own published location, so a national block filed to a Copenhagen office reads as Copenhagen everywhere.
Someone checking an address gets further from the routing data than from the city label. Look at the origin ASN on the specific prefix and see whether it belongs to a mobile carrier such as 3 or TDC, to a network peering at DIX, or to one of the 123 networks recorded inside the Copenhagen facilities. The netname and the registered holder on that prefix say who received the block. Where a prefix originates from a mobile ASN, treat the city as the operator's filing, not as a position.
Mobile carriers in Denmark
A mobile address in Copenhagen is routed by one of the country's operators. Each entry lists the operator's ASNs, so you can check which network an address belongs to.
Questions
Which internet exchanges are in Copenhagen?
PeeringDB lists five. DIX, the Danish Internet Exchange, has 28 participants, STHIX - Copenhagen has 19, DE-CIX Copenhagen and NorthIX have 11 each, and LabIX, the Labitat Internet Exchange, has 4. The city also has seven colocation facilities holding 123 network presences.
Do Danish mobile carriers peer in Copenhagen?
Some do. The registry shows 3 (AS44034) at DIX and at STHIX - Copenhagen, and TDC (AS3292) at DE-CIX Copenhagen. Telenor (AS9158) and the Telia mobile ASNs 3308 and 12435 have no exchange presence recorded in the city.
Does an IP that geolocates to Copenhagen mean the device is there?
No. The city comes from the operator's registry entry for the block and from geolocation databases that follow it. A Danish carrier can route customers anywhere in the country through gateways whose addresses are filed to Copenhagen, so the label describes paperwork rather than a position.
Sources
- PeeringDB - exchanges, participant counts, facilities and network presence, snapshot 2026-09-07
- PROXIES.SX carrier and ASN registry - operator ASNs used to match peering participants