Actually I was able to find this information...

root     13453     1  0 10:28 ?        00:00:00 dnsmasq --user=root --cache-size=200 --conf-file=/etc/dhcpd/dhcpd.conf --dhcp-lease-max=2147483648

Here is that config, with some things redacted...

$ cat /etc/dhcpd/dhcpd.conf

interface=ovs_eth0 dhcp-range=set:ovs_eth00,192.168.86.100,192.168.86.254,255.255.255.0,86400 dhcp-option=tag:ovs_eth00,option:router,192.168.86.1 dhcp-option=tag:ovs_eth00,option:domain-search,local dhcp-option=tag:ovs_eth00,option:domain-name,local dhcp-option=tag:ovs_eth00,option:dns-server,192.168.86.53 dhcp-host=b8:27:eb:8a:76:26,octopi,192.168.86.101,86400 [REMOVED A BUNCH OF dhcp-host ENTRIES] dhcp-leasefile=/etc/dhcpd/dhcpd.conf.leases dhcp-script=/usr/share/dhcpd/dhcpd-script.sh

I ran the same nslookup command with octopi/192.168.86.101 and got the same result. Missing the suffix.