DDNS (Dynamic DNS)
A service that automatically updates a DNS record when the host's IP address changes, useful for residential connections with rotating IPs.
Dynamic DNS (DDNS) is the practice of automatically updating an A or AAAA record whenever the host's public IP changes. A small client on the host (router, NAS, home server) periodically reports its current IP to a DDNS provider, which republishes the matching hostname (e.g. `myhome.dyndns.org`). DDNS makes services reachable behind ISP connections that hand out rotating public IPs. RFC 2136 defines the standard DNS UPDATE protocol used internally by enterprise DDNS, while consumer DDNS providers usually use a vendor-specific HTTPS API.