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Re:Ethereum from scratch – Part 1: Ping by Roxxik on Thursday July 20, 2017 @05:26PM (#14816432)
documentation says it all:

"bytes address; // BE encoded 4-byte or 16-byte address (size determines ipv4 vs ipv6)"[0]

[0]: https://github.com/ethereum/devp2p/blob/master/rlpx.md

Re:Ethereum from scratch – Part 1: Ping by mgbmtl on Thursday July 20, 2017 @05:40PM (#14816543)
thanks!