Non-existant URLs
Chris
chris at nospam.datafoundry.com
Mon Jun 6 19:47:57 UTC 2005
<aatcbbtccctc at yahoo.com> wrote in message news:d8210d$2vhu$1 at sf1.isc.org...
> Hi folks
>
> Say I type a non-existant URL; for example,
> "http://www.jksfdjiteui4wtknfsjkfzuisfz.com".
>
> When I do that, from a PC in Australia, I get an instant error that the
> URL does not exist. The delay is imperceptible. I feel that there has
> not been enough time to send a query right back through to a root
> server.
>
> So, how is it /known/ that the URL does not exist? Or am I wrong in
> assuming that a query right back through to a root server, should take
> at least a few seconds?
>
> TIA,
> TC
>
>
No, DNS just works really fast.
[chris at uranium chris]$ dig jksfdjiteui4wtknfsjkfzuisfz.com +trace
; <<>> DiG 9.2.1 <<>> jksfdjiteui4wtknfsjkfzuisfz.com +trace
;; global options: printcmd
.. 217900 IN NS H.ROOT-SERVERS.NET.
.. 217900 IN NS I.ROOT-SERVERS.NET.
.. 217900 IN NS J.ROOT-SERVERS.NET.
.. 217900 IN NS K.ROOT-SERVERS.NET.
.. 217900 IN NS L.ROOT-SERVERS.NET.
.. 217900 IN NS M.ROOT-SERVERS.NET.
.. 217900 IN NS A.ROOT-SERVERS.NET.
.. 217900 IN NS B.ROOT-SERVERS.NET.
.. 217900 IN NS C.ROOT-SERVERS.NET.
.. 217900 IN NS D.ROOT-SERVERS.NET.
.. 217900 IN NS E.ROOT-SERVERS.NET.
.. 217900 IN NS F.ROOT-SERVERS.NET.
.. 217900 IN NS G.ROOT-SERVERS.NET.
;; Received 372 bytes from 192.168.3.113#53(192.168.3.113) in 1 ms
com. 172800 IN NS A.GTLD-SERVERS.NET.
com. 172800 IN NS G.GTLD-SERVERS.NET.
com. 172800 IN NS H.GTLD-SERVERS.NET.
com. 172800 IN NS C.GTLD-SERVERS.NET.
com. 172800 IN NS I.GTLD-SERVERS.NET.
com. 172800 IN NS B.GTLD-SERVERS.NET.
com. 172800 IN NS D.GTLD-SERVERS.NET.
com. 172800 IN NS L.GTLD-SERVERS.NET.
com. 172800 IN NS F.GTLD-SERVERS.NET.
com. 172800 IN NS J.GTLD-SERVERS.NET.
com. 172800 IN NS K.GTLD-SERVERS.NET.
com. 172800 IN NS E.GTLD-SERVERS.NET.
com. 172800 IN NS M.GTLD-SERVERS.NET.
;; Received 509 bytes from 128.63.2.53#53(H.ROOT-SERVERS.NET) in 108 ms
com. 172800 IN SOA a.gtld-servers.net.
nstld.verisign-grs.com. 1118086967 1800 900 604800 900
;; Received 122 bytes from 192.5.6.30#53(A.GTLD-SERVERS.NET) in 91 ms
See .. doesn't take long at all. Centainly not "a few seconds" ;-)
Chris.
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