Brno · Czech Republic
PeeringDB records two exchanges in Brno, BR-IX with 8 participants and CBIX with none listed, so BR-IX is the better connected of the two. Four colocation facilities hold 13 network presences, Master DC Brno counting 8. An address that geolocates to Brno tells you which network registered the block, not where the device is.
Internet exchanges in Brno
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 |
|---|---|---|
BR-IX Brno University of Technology | 8 | none in the registry |
CBIX Commercial Brno Internet Exchange | 0 | 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 |
|---|---|---|
| Master DC Brno | 8 | Cejl 20 |
| itself TH Brno | 3 | Pálavské náměstí 11 |
| DC Kounicova | 1 | Kounicova 67a |
| DC Antoninska | 1 | Antoninska 1 |
What a Brno IP address tells you
Brno's exchange peering is small in the registry. BR-IX, listed under Brno University of Technology, records 8 participants, and CBIX, the Commercial Brno Internet Exchange, has no participants at all. What capacity does appear sits mostly in colocation, and the counts stay modest there too. Four facilities hold 13 network presences between them, with Master DC Brno at 8, itself TH Brno at 3, and DC Kounicova and DC Antoninska at 1 each. Neither exchange records a carrier ASN, so no Czech mobile operator peers in Brno as far as PeeringDB shows.
An address that geolocates to Brno may have nothing in the city behind it. An operator announces address blocks from a registry record that names one location for an entire allocation, and that location is usually a registered office rather than the rack. Czech mobile traffic from O2 (AS5610), T-Mobile (AS13036) and Vodafone (AS16019) leaves through a small number of gateways, so a subscriber address rarely maps to the town holding the handset. Geolocation databases repeat the operator's published location, which makes the city string a claim rather than a measurement.
With 8 exchange participants and 13 network presences in local facilities on record, the Brno city label carries little routing weight, and the origin ASN and the netname on the specific prefix say more. Those two fields show which network announces the block and how it registered the range. A prefix originating from a Czech mobile ASN describes a mobile pool wherever the subscriber happens to be, while one originating from a network inside Master DC Brno points at hosting in the city.
Mobile carriers in the Czech Republic
A mobile address in Brno 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 Brno?
PeeringDB lists BR-IX, associated with Brno University of Technology, holding 8 participants, and CBIX, the Commercial Brno Internet Exchange, with no participants recorded. BR-IX is the better connected of the two. Four colocation facilities in the city account for 13 network presences.
Do Czech mobile carriers peer in Brno?
Neither Brno exchange records a carrier ASN, so O2 (AS5610), T-Mobile (AS13036) and Vodafone (AS16019) are not listed as peers in the city. That is what the registry publishes; operators can interconnect privately without it showing up in PeeringDB.
Does an IP that geolocates to Brno mean the device is there?
No. The city comes from the operator's registry record and from databases that copy it. Mobile networks carry subscriber traffic to a few gateways before it reaches the internet, so a Brno address can belong to a device somewhere else in the country.
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