topsy.com.		30 IN SOA usmsc2-extxfr-001.dns.apple.com. hostmaster.apple.com. (
				42         ; serial
				1800       ; refresh (30 minutes)
				900        ; retry (15 minutes)
				2419200    ; expire (4 weeks)
				1800       ; minimum (30 minutes)
				)

Name servers:
topsy.com.		30 IN NS a.ns.apple.com.
topsy.com.		30 IN NS b.ns.apple.com.
topsy.com.		30 IN NS c.ns.apple.com.
topsy.com.		30 IN NS d.ns.apple.com.