The Baden-Württemberg Internet Exchange (BW-IX) Karlsruhe is a facility operated by INKA e.V. and located at Campus South of Karlsruhe Institute of Technology (KIT) in Karlsruhe, Germany.


The purpose of the BW-IX is to alleviate the exchange of data traffic between networks that constitute the southern part of the German Internet structure.
BW-IX Karlsruhe is operational since 2016 and the first connected networks are

1&1 Internet SE - AS8560

BelWü-Koordination - AS553

TelemaxX Telekommunikation GmbH - AS12843

plan b. solutions GmbH - AS202113


But BW-IX is open to any ISP/operator, who wants to exchange traffic with other operators. The key is the unique BGP AS-number.

Step 1


Interested network/operator contacts INKA e.V. to setup an agreement.

Step 2


Decide the endpoint and capacity of the connections and establish the physical connection to the BW-IX. The BGP route-server will be configured to accept a BGP connection from you.

Step 3


Start peering :)

c/o INKA e.V.

Postfach 3341

76019 Karlsruhe



Tel:  +49 721 388590

Fax: +49 721 388598





VR 102328 AG Mannheim


Enrik Berkhan

Ralf Sauther

Bernd Strehhuber

The steps in joining are:

Service information

The BW-IX offers two ways of connecting to the IXP net: 

Switched 1 Gbit Ethernet

Switched 10 Gbit Ethernet

If other types are desired, do contact INKA technical staff.


Peering is bilateral with the exception of route servers. There is no MLPA.

BGP-4 or successor is used for peering and peers must set NEXT_HOP_SELF if advertising routes from other BW-IX participants.

Participants may not point default or otherwise use another participant's resources without permission.

Broadcast traffic may not delivered to the exchange, except as needed for normal operation and troubleshooting.

Participants may not sniff traffic between other participants.


Switch Interconnection Policy

Members may only utilize a single layer-2 MAC address to place a single layer-3 router per port allocated from the BW-IX switch fabric unless by prior agreement.