When the internet doesn't see an update to your zonefile

Every once in awhile we see a situation where somebody changes the IP address one of their hostname (A records) points at and the rest of the world still sees the old address.

Common causes of this include:

• You forgot to increment the zone’s serial in the SOA record (*thwap*). Increment the serial and reload the zone again.
• The nameserver you are using to check your hostname is a resolver / recursor that already has this record in its DNS cache and is answering with its cached data.

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