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+* R53
+
+~r53~ is a dynamic DNS client for AWS Route 53. It queries the host's
+public IPv4 and IPv6 addresses via OpenDNS (falling back to Google) and
+upserts the corresponding =A= and =AAAA= records for each domain.
+
+** Usage
+
+#+begin_src shell
+r53 -zone ZONEID [-ttl SECONDS] <domain>...
+#+end_src
+
+Flags:
+
+- =-zone= — Route 53 hosted zone ID (required)
+- =-ttl= — TTL of the DNS records in seconds (default: 300)
+
+Arguments:
+
+- =<domain>= — one or more domain names to update
+
+~r53~ requires the =dig= command and AWS credentials from the SDK default
+chain (environment, shared config, or IMDS).
+
+On success the command writes nothing to =stdout=; it logs the Route 53
+response for each domain to =stderr= at debug level.
+
+** Examples
+
+#+begin_src shell
+$ r53 -zone Z1234567890EXAMPLE example.com www.example.com
+
+$ r53 example.com
+time=2026-10-24T03:08:42Z level=ERROR source=…/cmd/r53/main.go:38 \
+	msg=failed error="missing hosted zone id"
+#+end_src
+
+** Installation
+
+#+begin_src shell
+go install code.chimeric.al/dwrz/r53/cmd/r53@latest
+#+end_src