我正在寻找一个工具来通过DNS服务器查找域名，并输出解决的时间。 我的要求是它应该绕过DNScaching。
有没有人使用过这样的工具？
注意：“挖”没有任何选项来绕过caching，因此在这种情况下将不会有用。
dig也不使用任何caching，而是直接查询configuration好的parsing器。 如果该parsing器caching，则可以使用dig的+ trace选项不使用parsing器，而是直接从根服务器查询DNS：
dennis@lightning:~$ dig +trace serverfault.com A ; <<>> DiG 9.9.3-rpz2+rl.13214.22-P2-Ubuntu-1:9.9.3.dfsg.P2-4ubuntu1 <<>> +trace serverfault.com A ;; global options: +cmd . 397719 IN NS j.root-servers.net. <cut more records> . 518093 IN RRSIG NS 8 0 518400 20131210000000 20131202230000 59085 . f0hHbyv9t6RjM+S7xhK0ZfE1QXHTwyM8T8CDlwAwk+HZxTen+t84c41O kOM1n2eceUdZKaZ3e6xXbkbqskqSIMxgGLs4yo1WCqXVsxcwitvnNfIH HIvUZ+FuuPavS3YZFLDh1yFABzUgdjUUhxYj0O8vGM3tyPmqxlz/5tOM bO8= ;; Received 857 bytes from 127.0.1.1#53(127.0.1.1) in 394 ms com. 172800 IN NS m.gtld-servers.net. <cut more records> com. 86400 IN DS 30909 8 2 E2D3C916F6DEEAC73294E8268FB5885044A833FC5459588F4A9184CF C41A5766 com. 86400 IN RRSIG DS 8 1 86400 20131210000000 20131202230000 59085 . HIEdgrZDVtt+RismerX3wUwnourQWV1IOZjU9WZ0OGgyWl/SrotZkRoP DkpL4mwQ8DrcLCutcUZQ9jild82LE099JKPSGqOhP0Jo1eElIz7adI83 pVCuWSbZVAr44tbCCG/cUJ4x2/U5EGXObZtwx8xsx92Es9+BYlGxof8h Uao= ;; Received 739 bytes from 198.41.0.4#53(a.root-servers.net) in 389 ms serverfault.com. 172800 IN NS ns1.serverfault.com. serverfault.com. 172800 IN NS ns2.serverfault.com. CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400 IN NSEC3 1 1 0 - CK0Q5NFFJS5FUB0F2DNA098SBN0O663V NS SOA RRSIG DNSKEY NSEC3PARAM CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400 IN RRSIG NSEC3 8 2 86400 20131208054132 20131201043132 22625 com. Zz/lcv0uETfq4C+HNgnwGv4OjC47xg68ynrm+LUSqU1KG3sGHPbLGN0z 42xckt5KmK/uFnTcBATcEDkz/tCGA1ZMDPdjC5oK25T2yekkMVunZEgm uWx4cZw5oYd5DjD46WaMq6gdNUGL1kIk1/WzferodB6XN2AafrXbu3Zr NrQ= 9927MV13364KIN8K2F46QC2KIS54GB78.com. 86400 IN NSEC3 1 1 0 - 992CS48MFUM4P9CUSBGKOON6Q03NL1FA NS DS RRSIG 9927MV13364KIN8K2F46QC2KIS54GB78.com. 86400 IN RRSIG NSEC3 8 2 86400 20131210053605 20131203042605 22625 com. vdWi92PKyDk6b0U9d2Q1zpBRHZRKLS63PuYbdGD4JIRNv6MGNxRq5GUa CGp4CbfWNm03UaVbyel9zu6O6KYNeLHOpKUWNjTKnNHJuNcNBQqkj4V0 5Tpz7TNBZnQRwRixrSGnZmG33qKXjVjRXDWjj0Um5wE3x7sGJ1FoU6vy 3dE= ;; Received 597 bytes from 192.42.93.30#53(g.gtld-servers.net) in 394 ms serverfault.com. 300 IN A 198.252.206.16 serverfault.com. 300 IN NS ns2.serverfault.com. serverfault.com. 300 IN NS ns1.serverfault.com. ;; Received 128 bytes from 198.252.206.80#53(ns1.serverfault.com) in 100 ms