Part of HSCN domain naming standards and policies
Reverse-lookup zone (ARPA zone)
A reverse-lookup or ARPA zone exists where one or more PTR records are collected together into a self-contained zone arranged by IP address, and typically broken up by classless inter-domain routing (CIDR) boundaries.
The following standards apply:
- ARPA zones on the internet can only be created for subnets actually assigned to NHS England by RIPE.
- ARPA zones on HSCN can only be requested for subnets actually extant in peering.
- ARPA zones on HSCN will be consolidated into /16 boundaries.
- ARPA zones on HSCN cannot be delegated off-infrastructure.
Eligibility
ARPA zones necessarily remain under the control of NHS England.
Lifecycle
ARPA zones will be reviewed regularly and removed immediately when they are no longer required.
Empty ARPA zones will be automatically removed without notice.
Last edited: 11 June 2024 12:06 pm