Re:Ask HN: Why is ipq.co so fast?
by pedrocr on Friday October 22, 2010 @06:10AM
(#1819145)
Two reasons:
- If the domain is totally new your company's DNS server will not have it in cache and will query the authoritative server (probably what happened here)
- If the domain already exists in your company's DNS server cache it needs to have a TTL set, which basically defines how long it can be in cache before the original authoritative server is queried again (see http://en.wikipedia.org/wiki/Time_to_live#DNS_records). If this is set low the cache is less effective but DNS changes propagate faster.
- If the domain is totally new your company's DNS server will not have it in cache and will query the authoritative server (probably what happened here)
- If the domain already exists in your company's DNS server cache it needs to have a TTL set, which basically defines how long it can be in cache before the original authoritative server is queried again (see http://en.wikipedia.org/wiki/Time_to_live#DNS_records). If this is set low the cache is less effective but DNS changes propagate faster.