Prague · Czech Republic
PeeringDB records three internet exchanges in Prague, with NIX.CZ the best connected at 175 participants, alongside NIX.CZ FENIX with 8 and 1-CZ FREE with 6. Twenty colocation facilities hold 325 network presences, CE Colo Prague counting 151. An address geolocating to Prague shows where an operator registered the block, not where a device sits.
Internet exchanges in Prague
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 |
|---|---|---|
NIX.CZ Neutral Internet Exchange in the Czech Republic | 175 | |
NIX.CZ FENIX | 8 | none in the registry |
1-CZ FREE | 6 | 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 |
|---|---|---|
| CE Colo Prague | 151 | Nad Elektrarnou 1428/47 |
| TTC TELEPORT DC1 | 80 | Tiskarska 10 |
| TTC TELEPORT DC2 | 31 | Sazecska 10 |
| GTS Telehouse Prague | 17 | Vinohradská 190 |
| DC Tower Zizkov CRa | 16 | Mahlerovy sady 1 |
| DC Coolhousing - Prague | 5 | Vinohradská 2405/190 |
| Casablanca INT s.r.o. | 5 | Vinohradská 184 |
| CE Colo DC7 Prague | 5 | K Pérovně 1616/2 |
| Master DC Prague | 3 | Kodaňská 46 |
| GTS Nagano Prague | 3 | U nakladoveho nadrazi 3156/6 |
| VSHosting ServerPark DC1 | 3 | Sodomkova 1575/5 |
| Pragonet Telehouse Prague | 1 | 5. května 65 |
Showing the 12 facilities with the most networks, of 20 recorded.
What a Prague IP address tells you
NIX.CZ carries most of Prague's exchange peering. The city's three exchanges hold 189 participant records between them, and NIX.CZ has 175, with NIX.CZ FENIX at 8 and 1-CZ FREE at 6. Weight also sits in colocation rather than only on exchange fabric. Twenty facilities hold 325 network presences, CE Colo Prague accounting for 151, TTC TELEPORT DC1 for 80 and TTC TELEPORT DC2 for 31. Four carrier ASNs peer at NIX.CZ, and two belong to Czech mobile operators, O2 (AS5610) and Vodafone (AS16019). T-Mobile's mobile ASN, 13036, does not appear there.
An address that geolocates to Prague need not sit on a device in Prague. An operator announces a block from a registry record, and that record carries one location for the whole allocation, often the company's own office. Czech mobile traffic from O2, T-Mobile and Vodafone leaves through a small number of gateways, so a handset far from the city can exit on a Prague-registered address. Geolocation databases follow the operator's published location, which means the city label repeats what the operator declared rather than measuring the handset.
Someone checking a Prague address should read the origin ASN and the netname on the specific prefix instead of the city label. If the origin is AS5610, AS13036 or AS16019, the address belongs to a Czech mobile network and the city field describes an operator registration. A prefix originating from a network present at NIX.CZ or in CE Colo Prague points instead at hosting or transit inside the city's facilities. The registry names which network announces a block; it does not say where the equipment stands.
Mobile carriers in the Czech Republic
A mobile address in Prague 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 Prague?
PeeringDB lists NIX.CZ with 175 participants, NIX.CZ FENIX with 8 and 1-CZ FREE with 6, so NIX.CZ is the best connected of the three. Colocation adds more, with 20 facilities in the city recording 325 network presences and CE Colo Prague holding 151 of them.
Do Czech mobile carriers peer in Prague?
NIX.CZ records four carrier ASNs, and two of them belong to Czech mobile operators, O2 (AS5610) and Vodafone (AS16019). T-Mobile Czech Republic's mobile ASN, 13036, is not among them. That reflects what PeeringDB publishes, and private interconnection does not appear in the registry.
Does an IP that geolocates to Prague mean the device is there?
No. The city label comes from the operator's registry record and from geolocation databases that copy it. Mobile networks route subscriber traffic through a few gateways, so a Prague address can carry traffic from a handset elsewhere in the country. Read the origin ASN instead.
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