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From the Wireshark man page, search for "FILES" and you will come across the documentation for the various files that Wireshark uses for various name resolution capability.

For example:

  • Name Resolution (hosts)
  • Name Resolution (subnets)
  • Name Resolution (ethers)
  • Name Resolution (manuf)
  • Name Resolution (services)
  • Name Resolution (ipxnets)

The 2 you mentioned specifically are handled by the services and manuf files:

The services file is used to translate port numbers into names. Both the global services file and personal services files are used if they exist.

The manuf file is used to match the 3-byte vendor portion of a 6-byte hardware address with the manufacturer's name; it can also contain well-known MAC addresses and address ranges specified with a netmask. The manuf file is looked for in the same directory as the global preferences file.