Category: DNS

Test DMARC record for a domain
article #1086, updated 2411 days ago

A free tool:

https://www.dmarcanalyzer.com/dmarc/dmarc-record-check/

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SPF for Constant Contact
article #873, updated 2418 days ago

Awhile ago it came to light that the following needed to be added to SPF records for email-enabled domains using Constant Contact:

include:ccsend.com include:constantcontact.com include:confirmedcc.com

Things have gotten a lot better. The following now covers all of the above:

ip4:208.75.120.0/22

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DNS Root Servers
article #1017, updated 2648 days ago

As of this writing, the current authoritative list, from here:

https://www.iana.org/domains/root/servers

is:

a.root-servers.net 198.41.0.4 2001:503:ba3e::2:30 VeriSign, Inc.
b.root-servers.net 192.228.79.201 2001:500:84::b University of Southern California (ISI)
c.root-servers.net 192.33.4.12 2001:500:2::c Cogent Communications
d.root-servers.net 199.7.91.13 2001:500:2d::d University of Maryland
e.root-servers.net 192.203.230.10 2001:500:a8::e NASA (Ames Research Center)
f.root-servers.net 192.5.5.241 2001:500:2f::f Internet Systems Consortium, Inc.
g.root-servers.net 192.112.36.4 2001:500:12::d0d US Department of Defense (NIC)
h.root-servers.net 198.97.190.53 2001:500:1::53 US Army (Research Lab)
i.root-servers.net 192.36.148.17 2001:7fe::53 Netnod
j.root-servers.net 192.58.128.30 2001:503:c27::2:30 VeriSign, Inc.
k.root-servers.net 193.0.14.129 2001:7fd::1 RIPE NCC
l.root-servers.net 199.7.83.42 2001:500:9f::42 ICANN
m.root-servers.net 202.12.27.33 2001:dc3::35 WIDE Project

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Installing nslookup on Linux
article #1008, updated 2708 days ago

Increasingly, nslookup is not installed by default in major Linux distros. On Arch-based and Debian-based distros, it’s in package dnsutils,

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Opt out of the Cox special DNS
article #884, updated 3084 days ago

By default, Cox will DHCP to your systems some DNS servers which behave like OpenDNS, i.e., if there is a DNS name miss, the servers will show a hit which is a Cox search page. This can confuse a lot of things. Cox has provided a way around this:

http://www.cox.com/residential/support/internet/article.cox?articleId=e14ee070-6448-11df-ccef-000000000000

for residential at least, it uses these two IPs as static DNS:

68.105.28.13
68.105.29.13

and these do appear to be noticeably faster!

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CenturyLink DNS servers
article #881, updated 3087 days ago

A great place to find them:

http://internethelp.centurylink.com/internethelp/dns-ctl.html

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DNS Root Server IPs
article #780, updated 3362 days ago

Here is the canonical source:

http://www.internic.net/zones/named.root

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'dig' command to pull up all records for a single hostname
article #597, updated 3861 days ago

To pull up a list of all DNS records for a single hostname:

dig +nocmd yourdomain.com any +multiline +noall +answer

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Web/GUI front ends for BIND
article #287, updated 4741 days ago

Here is an interesting list:

http://www.debianadmin.com/bind-dns-server-web-interfacefrontend-or-gui-tools.html

But the best may be here:

http://sourceforge.net/projects/smbind/

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SPF records for email
article #228, updated 4902 days ago

SPF records are DNS entries for entire domains, which do a whole lot to prevent spam.  They are required on the sender side, these days, for email to be successfully received by many carriers small and large, including Yahoo and Embarq and many others.  For lots of general information:

http://www.openspf.org

For more details and syntax:

http://www.openspf.org/SPF_Record_Syntax

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