* INCEPTION (not recommended): Sets the SOA serial to the last inception time in YYYYMMDD01 format. Uses localtime to find the day for inception time. **Warning**: The SOA serial will only change on inception day, so changes to the zone will get visible on slaves only on the following inception day.
* INCEPTION-WEEK (not recommended): Sets the SOA serial to the number of weeks since the epoch, which is the last inception time in weeks. **Warning**: Same problem as INCEPTION
* EPOCH: Sets the SOA serial to the number of seconds since the epoch. **Warning**: Don't combine this with AXFR - the slaves would keep refreshing all the time. If you need fast updates, sync the backend databases directly with incremental updates (or use the same database server on the slaves)
+* NONE: Ignore [`default-soa-edit`](settings.md#default-soa-edit) and/or [`default-soa-edit-signed`](settings.md#default-soa-edit-signed) setings.
## TSIG-ALLOW-AXFR
Allow these named TSIG keys to AXFR this zone (see [Provisioning outbound AXFR access](modes-of-operation.md#provisioning-outbound-axfr-access)).
Name to insert in the SOA record if none set in the backend.
+## `default-soa-edit`
+* String
+* Default: empty
+* Available since: 3.4.7
+
+Use this soa-edit value for all zones if no [`SOA-EDIT`](metadata.md#SOA-EDIT) metadata value is set.
+
+## `default-soa-edit-signed`
+* String
+* Default: empty
+* Available since: 3.4.7
+
+Use this soa-edit value for all signed zones if no [`SOA-EDIT`](metadata.md#SOA-EDIT) metadata value is set. Overrides [`default-soa-edit`](#default-soa-edit)
+
## `default-soa-mail`
* String