Kolkata · India
PeeringDB records six internet exchanges in Kolkata sharing 116 participants, and 11 colocation facilities holding 151 network presences. NIXI Kolkata and Kolkata IX are the best connected, at 29 participants each. An address that geolocates to Kolkata tells you which network published Kolkata for that block, not where the device using it happens to be.
Internet exchanges in Kolkata
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 |
|---|---|---|
NIXI Kolkata National Internet eXchange of India | 29 | none in the registry |
Kolkata IX India Internet Foundation | 29 | none in the registry |
Extreme IX Kolkata ExtremeIX Kolkata | 25 | none in the registry |
DE-CIX Kolkata | 18 | none in the registry |
OpenSwitch-IX OpenSwitch-IX India's First IXP to offer tunnels | 9 | none in the registry |
AMS-IX Kolkata Amsterdam Internet Exchange Kolkata | 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 |
|---|---|---|
| STT Kolkata 1 | 57 | TCL,VSB,Ultadanga, 1/18, CIT SCHME, VII M |
| TATA Communications Kolkata | 41 | 1, CIT Rd |
| CtrlS Kolkata DC1 | 29 | Newtown, New Town, |
| Sify-DLF-Kolkata | 12 | DLF IT Park, Floor 2 Salt Lake City |
| BASIS DC Kolkata | 4 | Moni Bhandar, Webel Bhaban Salt Lake, Sector V, Block EP&GP |
| Sify-LDT-Kolkata | 3 | Lansdowne Towers, 2/1a Sarat Bose Road, 3rd Floor |
| NIXI Kolkata | 3 | NIXI C/O, STT, 1, Videsh Sanchar Bhavan, 18, CIT Rd, Ultadanga, Kolkata, West Bengal 700054 |
| DV-IDC-KOL01 | 1 | Softel Telecom Pvt. Ltd., 224, AJC Bose Road, Krishna Building, Suite No. 911 & 912 |
| Ishan Technologies Kolkata | 1 | 603,6th Floor,DN -21, |
| Railtel Kolkata | 0 | 14, Strand Road Kolkata-1 |
| Nxtra Data Kolkata DC 1 | 0 | Action Area IIE, Newtown, New Town |
What a Kolkata IP address tells you
No single exchange dominates Kolkata. NIXI Kolkata and Kolkata IX both list 29 participants, Extreme IX Kolkata has 25 and DE-CIX Kolkata 18, with OpenSwitch-IX at nine and AMS-IX Kolkata at six, for 116 in total. Colocation holds more networks than the exchanges hold members, at 151 across 11 facilities, with STT Kolkata 1 at 57 networks, TATA Communications Kolkata at 41 and CtrlS Kolkata DC1 at 29. Two of those facilities, Railtel Kolkata and Nxtra Data Kolkata DC 1, record no networks. No carrier ASN is attached to any Kolkata exchange.
An address that geolocates to Kolkata reflects the operator's own registry entry for that prefix. Operators announce blocks from records that name an organisation and an administrative address, and neither has to sit near the equipment. Mobile traffic in India leaves through a small number of gateways, so an address published as Kolkata can carry a session from a handset in another state. Geolocation databases build on the published location, which makes the city field a copy of the operator's filing.
Read the origin ASN and the prefix record instead of trusting the city name. The netname and the registered organisation on the exact block say whether the announcing network is a mobile operator, a regional broadband provider or a tenant of one of the 11 Kolkata facilities. With only 116 exchange participants recorded, a network that peers here is a small set, and that set is checkable. The city label is the least reliable part of a geolocation answer.
Questions
Which internet exchanges are in Kolkata?
Six. NIXI Kolkata and Kolkata IX each list 29 participants, Extreme IX Kolkata has 25 and DE-CIX Kolkata 18, while OpenSwitch-IX records nine and AMS-IX Kolkata six. That comes to 116 participants, the smallest exchange total among the Indian cities that have an exchange recorded here.
Do India mobile carriers peer in Kolkata?
No carrier ASN is recorded against any of the six Kolkata exchanges in this snapshot. That is not proof that no mobile network peers in the city, only that PeeringDB does not show one, so the question cannot be answered from the registry alone.
Does an IP that geolocates to Kolkata mean the device is there?
No. Kolkata in a geolocation result comes from the operator's published record for the address block. Because mobile operators route subscriber traffic through a few gateways and assign addresses from shared pools, the device behind a Kolkata address can be elsewhere in India.
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