When ever a new system or entry added to a DNS server ,then the DNS server will keep a time stamp for that entry .then for then next 7 days (No-refresh interval )the server will not cross check this entry .after 7 days the dns server will try to get update from the client (Refresh time)for the next 7 days. The process of no-refresh +refresh interval is called aging .If it does not get any response from the so called client, then it starts scavenge, means it will remove the entry from its database
DNS Monitoring tool
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