Manual

What OtterDNS does

OtterDNS is a hosted secondary nameserver. You keep your primary; we keep a transferred read-only copy online as your other nameserver.

Service addresses

Setup

1. Add the zone in the panel. Give the primary address, or leave it blank
   and we derive it from your zone's SOA MNAME.
2. Allow AXFR/IXFR from 203.0.113.53 on your primary.
3. Add ns.otterdns.net to the zone apex NS set and the registrar delegation.
4. Optional: configure NOTIFY to 203.0.113.53 so updates propagate instantly.

No TSIG is used: transfers are authorized by our published source address.

Examples

BIND (named.conf)

zone "example.com" {
    type primary;
    file "example.com.zone";
    allow-transfer { 203.0.113.53; };
    also-notify { 203.0.113.53; };
};

PowerDNS Authoritative

# pdns.conf
allow-axfr-ips=203.0.113.53/32
also-notify=203.0.113.53

Knot DNS (knot.conf)

remote:
  - id: otterdns
    address: 203.0.113.53
acl:
  - id: otterdns_transfer
    address: 203.0.113.53
    action: transfer
zone:
  - domain: example.com
    acl: otterdns_transfer
    notify: otterdns

NSD (nsd.conf)

zone:
    name: "example.com"
    zonefile: "example.com.zone"
    provide-xfr: 203.0.113.53 NOKEY
    notify: 203.0.113.53 NOKEY

Delegation

Zones that are never delegated to ns.otterdns.net are removed after 30 days. The zone detail page shows the exact date whenever the countdown is running.