NXDOMAIN / public resolvers and zen.spamhaus.org

Discussion in 'Mail Server Support' started by dns operations, Mar 27, 2011.

  1. dns operations

    dns operations New Email

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    After switching my forwarders to public resolvers, that zen.spamhaus.org was returning NXDOMAIN.

    So, I began some basic testing, and it seems both GoogleDNS and Level3 are returning NXDOMAIN when using a zen.spamhaus.org test domain. OpenDNS appears to be resolving zen.spamhaus.org without any issues.

    # google public dns
    $ host 107.178.203.192.zen.spamhaus.org 8.8.8.8
    Host 107.178.203.192.zen.spamhaus.org not found: 3(NXDOMAIN)

    $ host 107.178.203.192.zen.spamhaus.org 8.8.4.4
    Host 107.178.203.192.zen.spamhaus.org not found: 3(NXDOMAIN)

    # level3 dns
    $ host 107.178.203.192.zen.spamhaus.org 4.2.2.1
    Host 107.178.203.192.zen.spamhaus.org not found: 3(NXDOMAIN)

    # opendns
    $ host 107.178.203.192.zen.spamhaus.org 208.67.222.222
    107.178.203.192.zen.spamhaus.org has address 127.0.0.2

    $ host 107.178.203.192.zen.spamhaus.org 208.67.220.220
    107.178.203.192.zen.spamhaus.org has address 127.0.0.2

    So a word of warning if you do use public resolvers, that it might have unexpected results.
     


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