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DNS
DNS, BIND, DHCP, LDAP and Directory Services
nip.io - Dead simple wildcard DNS for any IP Address
unbound - Pi-hole as All-Around DNS Solution
dnsperftest
The 6 Best Free Dynamic DNS Providers
DHCP
ISC
How do I manually release a DHCP lease on the DHCP server itself?
How-To flush the DHCP server lease cache