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Editorial Team
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Asked: 2026-05-28T07:46:59+00:00

There is a function called if_nametoindex() that converts an interface name into an interface

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There is a function called if_nametoindex() that converts an interface name into an interface index. This function appears to be available on Linux and Windows. On Linux, I imagine these interface names might look like “eth0” or “wlan0”.

My question is: what do Win32 interface names look like? And are there any calls that let me query what interface names are available?

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  1. Editorial Team

    There’s also if_indextoname. I’ve added the output below. This style of name (e.g. loopback_0) is not the Win32 interface name. I guess these names only exist for compatibility with rfc2553. Win32 actually uses interface names like \DEVICE\TCPIP_{846EE342-7039-11DE-9D20-806E6F6E6963}.

    To enumerate all the interfaces you need to use GetIfTable and friends. if_nameindex is not supported.

    loopback_0
tunnel_0
tunnel_2
tunnel_3
ppp_0
ethernet_0
ethernet_1
ethernet_4
ppp_1
wireless_0
ethernet_9
tunnel_4
tunnel_1
tunnel_7
tunnel_8
wireless_5
tunnel_5
tunnel_9
tunnel_10
tunnel_6
wireless_1
wireless_2
ethernet_2
ethernet_3
ethernet_5
ethernet_6
ethernet_7
wireless_3
wireless_4
wireless_6
wireless_7
wireless_8
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