From https://kb.isc.org/docs/isc-dhcp-44-manual-pages-dhcpd#PORTS
( with TCP and imcp port bits cut out:)
Normally a DHCPv4 server will open a raw UDP socket to receive and send most DHCPv4 packets. It also
opens a fallback UDP socket for use in sending unicast packets. Normally these will b
root@nuc:/# ps aux | grep dhcpd | grep -v grep
root 3223 0.0 0.0 22764 9780 ?Ss Aug29 0:01
/usr/sbin/dhcpd -4 -q -cf /etc/dhcp/dhcpd.conf eno1
root@nuc:/# lsof -i -nP | grep dhcpd
dhcpd 3223 root7u IPv4 1903742 0t0 UDP *:67
dhcpd 3223 root 20u IP
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