The Portmap protocol is part of the ONC-RPC protocol family.

XXX - add a brief PROTO description here


XXX - add a brief description of Portmap history

Protocol dependencies

  • ONC-RPC: Portmap uses ONC-RPC as its transport protocol. It is one of the two ONC-RPC protocols that have a port number assigned to it; it is used to find out the port number or transport endpoint address assigned to a particular ONC-RPC program, so it needs to have its port number be a well known port number. The well known port number for Portmap is 111.

Example traffic

XXX - Add example traffic here (as plain text or Wireshark screenshot).


The Portmap dissector is (fully functional, partially functional, not existing, … whatever the current state is). Also add info of additional Wireshark features where appropriate, like special statistics of this protocol.

Preference Settings

(XXX add links to preference settings affecting how Portmap is dissected).

Example capture file

XXX - Add a simple example capture file to the SampleCaptures page and link from here. Keep it short, it's also a good idea to gzip it to make it even smaller, as Wireshark can open gzipped files automatically.

Display Filter

A complete list of Portmap display filter fields can be found in the display filter reference

Show only the Portmap based traffic:


Capture Filter

You cannot directly filter the Portmap protocol while capturing. However, as the port number used over TCP and UDP is well known (see above), you can filter on that one.

Capture Portmap traffic:

 port 111 

External links

  • RFC 1057 Remote Procedure Call, Version 2 - an older version of the ONC RPC specification, which describes, in appendix A, version 2 of the protocol.

  • RFC 1833 Binding Protocols for ONC RPC Version 2 - describes version 3 and 4 of the protocol. Those versions are also called "RPCBIND", as they support binding transport endpoint addresses, not just port numbers, to an ONC RPC program number, for use with protocols other than TCP or UDP, such as the OSI COTP and CLTP protocols.


Imported from https://wiki.wireshark.org/Portmap on 2020-08-11 23:18:00 UTC