怎样测试反向域名解析是否成功

nslookup -qt=ptr (ip地址)

例如：C:\Documents and Settings\Administrator>nslookup -qt=ptr 202.108.43.230
Server: ns2.chncomm.com
Address: 211.157.97.2

Non-authoritative answer:
230.43.108.202.in-addr.arpa     name = mail.sina.com.cn

43.108.202.in-addr.arpa nameserver = ns.bta.net.cn
43.108.202.in-addr.arpa nameserver = ns2.bta.net.cn
ns.bta.net.cn   internet address = 202.96.0.133

最后解析出域名