Tainan · Taiwan
PeeringDB records one exchange in Tainan, FOX, the Formosa Open eXchange, with 21 participants, and one facility, CHT Tainan YongKong IDC, with no networks listed against it. An address that geolocates to Tainan reports the location an operator filed for the block, which need not be where the device is.
Internet exchanges in Tainan
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 |
|---|---|---|
FOX Formosa Open eXchange | 21 | 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 |
|---|---|---|
| CHT Tainan YongKong IDC | 0 | No. 515, Zhongshan S. Rd., Yongkang Dist. |
What a Tainan IP address tells you
Tainan holds a single exchange in the registry. FOX, the Formosa Open eXchange, has 21 participants, and those 21 are the whole exchange peering count for the city. One facility appears, CHT Tainan YongKong IDC, with zero networks recorded as present, so nothing in the colocation column adds to the total. The carrier registry lists no Taiwan mobile operator ASNs and FOX records no carrier ASN among its participants, which leaves the data quiet on whether mobile networks interconnect in the city.
An address that geolocates to Tainan may belong to a device somewhere else. Operators announce blocks from a registry record that names one location for an allocation covering a wide area, and a network with 21 peers at FOX can serve customers well outside Tainan from the same range. Mobile traffic concentrates through a small number of gateways, so a phone in another city reads as the gateway location. Geolocation databases take the operator's published location, so they inherit its coarseness.
For a Tainan address, the origin ASN and the netname on the prefix say more than a city field. They identify the network announcing the block and the description its holder registered, and both stay verifiable against the same sources that generated the label. With 21 participants at FOX, checking whether an ASN sits on that list is quick, and an ASN missing from it is not exchanging traffic there.
Questions
Which internet exchanges are in Tainan?
One appears in PeeringDB. FOX, the Formosa Open eXchange, has 21 participants, and no other exchange is filed under the city. The single facility recorded for Tainan, CHT Tainan YongKong IDC, has no networks listed as present in it.
Do Taiwan mobile carriers peer in Tainan?
The records do not show it. FOX lists no carrier ASN among its 21 participants, and the carrier registry holds no mobile operator entries for Taiwan at all. An operator can still run infrastructure in the city without appearing in either dataset.
Does an IP that geolocates to Tainan mean the device is there?
No. The city comes from the registry record for the block or from the operator's published location, and one record can cover a national allocation. Mobile traffic exits through few gateways. Look at the origin ASN and the netname on the prefix.
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