DNS

DNS demystified: records and resolvers, DNSSEC, propagation, debugging name resolution, and why it's always DNS.

55 posts on DNS.

2026-06

2026-06-06 The ghost domain problem in DNS, and what we're doing about it

2020-09

2020-09-16 A new start for DNS Spy

2020-07

2020-07-08 How to measure Linux Performance Avoiding Most Typical Mistakes: Network

2019-03

2019-03-22 Initial impressions on running a Bitcoin Core full node

2019-02

2019-02-28 Showing the DNS score in your dashboard & an updated layout

2018-11

2018-11-27 Why your NS records matter
2018-11-19 A big update to DNS Spy – DNS Spy Blog

2018-05

2018-05-02 DNS Spy now checks for the “Null MX”

2017-09

2017-09-21 Due to CAA records, unable to issue TLS certs for names in private.cam.ac.uk
2017-09-21 Why we’ve cancelled our free tier – DNS Spy Blog
2017-09-20 DNS Research: using SPF to query internal DNS resolvers
2017-09-18 A proposal for cryptocurrency addresses in DNS
2017-09-17 Chrome & Firefox now force .dev domains to HTTPS via preloaded HSTS
2017-09-15 Cloudflare now serves F-Root instance
2017-09-09 CAA record checking now mandatory for Certificate Authorities

2017-05

2017-05-01 Are homogenic nameserver names a single point of failure?

2017-04

2017-04-20 Interview on Laravel Spark & DNS Spy
2017-04-19 DNS Spy has launched!
2017-04-08 CAA checking becomes mandatory for SSL/TLS certificates

2017-03

2017-03-01 DNS Spy enters public beta

2016-10

2016-10-23 Pi-Hole: A DNS-based blacklist for ads and tracking for Raspberry Pi

2016-02

2016-02-16 Critical glibc buffer overflow vulnerability in getaddrinfo() on Linux (CVE-2015-7547 & CVE-2015-5229)

2016-01

2016-01-03 The best tech question to ask in a job interview

2015-09

2015-09-01 CentOS 7 NetworkManager Keeps Overwriting /etc/resolv.conf

2015-08

2015-08-11 Bind/Named Crash: REQUIRE(*name == ((void *)0)) failed, CVE-2015-5477

2015-07

2015-04

2015-04-12 When The New TLD .SUCKS

2015-02

2015-02-01 Ntimed: an NTPD replacement

2015-01

2015-01-27 GHOST: critical glibc update (CVE-2015-0235) in gethostbyname() calls

2014-11

2014-11-23 Presentation: DNSSEC, The Good, The Bad & The Secure
2014-11-17 REST API best practices and versioning
2014-11-12 Slow login/DNS via Active Directory on OSX Mavericks and Yosemite (.local domains)

2014-10

2014-10-12 DNSSEC: NSEC3 iterations too big for weakest DNSKEY strength

2014-03

2014-03-23 What if you are the network admin tasked with blocking IPs in Turkey?

2012-08

2012-08-10 Now stop using dsbl.org blacklisting: it’s offline

2012-02

2012-02-09 RHEL 6/ CentOS 6: Slow SSH logins with DNS timeouts

2011-04

2011-04-03 WikiLeaks Mirror Hosting Page now offline

2011-03

2011-03-03 Profiling: Learning from Engadget's infrastructure on traffic spike handling (ie: iPad2 launch)

2010-12

2010-12-06 WikiLeaks’ mirrors: where are they hosted?

2010-07

2010-07-12 Implementing & Maintaining DNSSEC On Bind9 Nameservers

2009-07

2009-07-26 How To Change A Server’s Main IP Address (including DNS records) In Plesk

2009-01

2009-01-14 Using Plesk’s SMTP Server: DNS Blacklist Prevents Sending

2008-11

2008-11-23 Permanent Failure – Probe failed: Illegal To: address (invalid domain name)
2008-11-15 Named/Bind: Could not listen on UDP socket : permission denied
2008-11-07 Plesk Site Preview Not Working

2008-09

2008-09-15 Enable DNS Blackhole Lists & SPF Checks In Plesk’s Spamassassin
2008-09-09 A Recipe For Disaster: XSS, Google-Analytics.com And DNS Cache Poisoning
2008-09-01 Making Full Use Of 'Dig' In Linux

2008-08

2008-08-27 Why Is Mail Being Blocked By A Spamfilter?
2008-08-05 DNS Poisoning Attack, How Safe Am I?

2008-07

2008-07-24 NsLookup Is More Powerful Than You Think
2008-07-15 Domain theft at a new height

2008-06

2008-06-24 Changing network settings through the windows command line
2008-06-03 ThePlanet datacenter nog steeds offline