After finding this feature wasn’t implemented [1][2], I spent some time this evening learning phpIPAM‘s REST API and writing a short bash script to update phpIPAM’s mac field.

• The script will need the username and password of a user that has write permission to the addresses you want to update.
• You will need to create an api app, as described in the documentation.
• The script gets info on a single interface and updates addresses in a single subnet.
• The script will check that the mac needs updating and only update if necessery.
• The script will ignore addresses tagged as (3) “reserved” or (4) “dhcp”.
• The script won’t add new addresses, only update existing ones.
• The script will check local interface ips as well (as these aren’t in ARP)
• The script requires “iproute2”, “curl” and “jq” (Command-line JSON processor).

Code available at https://github.com/lazynooblet/scripts/tree/main/bash/phpipam-update-mac-from-arp