[coolj]

Since this is just sending out DISCOVERs and never REQUESTs on any OFFERs that come back, servers can technically reuse IPS from outstanding offers:

https://tools.ietf.org/html/rfc2131#page-31

      Because the servers have not committed any network address assignments on
      the basis of a DHCPOFFER, servers are free to reuse offered
      network addresses in response to subsequent requests.  As an
      implementation detail, servers SHOULD NOT reuse offered addresses
      and may use an implementation-specific timeout mechanism to decide
      when to reuse an offered address.

I'm curious if common DHCP servers like dnsmasq actually do reuse IPs from pending OFFERs, and what timeout they have, if any, before reuse. I poked around dnsmasq config but I did see any specific tuning for that.