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

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 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.