Vienna · Austria
PeeringDB records two exchanges in Vienna, VIX, the Vienna Internet Exchange, with 173 participants and ERA-IX Vienna with 13. The city's 29 facilities hold 375 network presences, the highest count at Digital Realty VIE1/2 with 192. VIX is the best connected exchange here. An IP that geolocates to Vienna identifies the operator holding the block, not the device's position.
Internet exchanges in Vienna
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 |
|---|---|---|
VIX Vienna Internet Exchange | 173 | |
ERA-IX Vienna | 13 | 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 VIE1/2 - Vienna | 192 | Louis-Haefliger-Gasse 10 |
| NTT Vienna1 Data Center (VIE1) | 47 | Computerstraße 4 |
| Vienna University Computer Center (Wien) | 27 | Universitaetsstrasse 7 |
| DATASIX Vienna (VIE1) | 20 | Hofmuehlgasse 3-5 |
| Nessus NDC1 | 13 | Fernkorngasse 10 |
| Nessus NDC2 | 13 | Karmarschgasse 23-25 |
| VIVI Vienna (Wien) | 8 | Liebiggasse 9 |
| ODC21 (IBM colocation site) | 7 | Richard-Neutra-Gasse 10 |
| Raiffeisen Diana Haus (RDH) | 6 | Lilienbrunngasse 7-9 |
| Raiffeisen Informatik Data Center (RDC) | 5 | Stadlauer Straße 66 |
| next layer Medienhaus | 5 | Heiligenstädter Lände 27c |
| next layer Fleischmarkt | 4 | Fleischmarkt 19 |
Showing the 12 facilities with the most networks, of 29 recorded.
What a Vienna IP address tells you
Vienna's routing weight sits in VIX. The exchange carries 173 of the 186 exchange participants PeeringDB records in the city, and ERA-IX Vienna carries the remaining 13. Colocation holds a separate count of 375 network presences across 29 facilities, concentrated in Digital Realty VIE1/2 with 192 networks, NTT Vienna1 with 47, the Vienna University Computer Center with 27 and DATASIX Vienna with 20. Austria's three mobile operators all show up in the VIX participant ASNs, A1 Telekom Austria on AS8447, Magenta Telekom on AS8412 and Drei on AS25255.
An address that geolocates to Vienna may not be a device in Vienna. An operator registers a block once, with a single address on the registry record, and geolocation databases follow that published location for every prefix under it. Mobile networks widen the gap. Austrian operators route subscriber sessions out through a small number of gateways, so a handset connected anywhere in the country can appear on an address the databases place in Vienna, because that is where the operator has recorded its own presence.
Check the origin ASN on the specific prefix rather than the city label. A route originated by AS8447, AS8562, AS8437, AS25255 or AS8412 belongs to an Austrian mobile network, whatever city a database prints, and the netname on that prefix names the operator holding it. A prefix announced by a hosting or transit network that peers into VIX or sits in one of the 29 local facilities reads differently in the registry from one a mobile operator announces, even when both resolve to the same city name.
Mobile carriers in Austria
A mobile address in Vienna 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 Vienna?
PeeringDB lists two. VIX, the Vienna Internet Exchange, has 173 participants, and ERA-IX Vienna has 13. VIX is the better connected of the two by a wide margin and accounts for most of the 186 exchange participants the registry records in the city.
Do Austrian mobile carriers peer in Vienna?
Yes. The VIX participant ASNs include AS8447 for A1 Telekom Austria, AS8412 for Magenta Telekom and AS25255 for Drei, so all three Austrian mobile operators in the carrier registry are present at the exchange. PeeringDB records none of them at ERA-IX Vienna.
Does an IP that geolocates to Vienna mean the device is there?
No. Geolocation databases read the location an operator published for a prefix, and mobile sessions exit through a few gateways rather than from the town the handset is in. A Vienna label tells you which network announces the block, not where the user is.
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