These could be SRV records for servers like Exchange.
Alternatively, if you prefer to set the values per-zone, right-click the zone and click Properties.
If your scavenging period is set to the default setting of 7 days, the records are purged only once a week.
Your DNS record can now exist for a period between 15 – 20 days.
These can be simple host (A) records for a device like a network printer or copier.
These could be CNAME (alias) records for web servers.
The no-refresh interval means the timestamps on your DNS records cannot be refreshed.