https://zonecheck.org/
Network and DNS Test Tools
Zonecheck, Domain DNS test, ensuring zone validity before delegation, including DNSSEC, ping and traceroute test, smtp open relay testing
dns testnetworktools
https://dnste.st/
DNS Test Suite - by MichaelCee
dns testsuitemichaelcee
https://gsexdev.blogspot.com/2006/12/exchange-smtp-log-file-dns-test-tool.html
Exchange SMTP Log file DNS Test tool Powershell script
This powershell script is a combination of some of my past scripts (in particular the DNS util script ) wrapped up in a nice little GUI with...
log filedns testexchangesmtptool
https://www.dnsleaktest.com/
DNS leak test
DNSleaktest.com offers a simple test to determine if you DNS requests are being leaked which may represent a critical privacy threat. The test takes only a few...
dns leaktest
https://dnsleaktest.com/
DNS leak test
DNSleaktest.com offers a simple test to determine if you DNS requests are being leaked which may represent a critical privacy threat. The test takes only a few...
dns leaktest
https://dnsmap.io/
DNSMap - Worldwide DNS Propagation Checker - Global test
Check the current IP of your domain name or hostname from multiple DNS nameservers and resolvers from all around the world. Instant propagation check.
dns propagation checkerdnsmapworldwideglobaltest
https://lists.freebsd.org/archives/freebsd-ports-bugs/2025-August/079760.html
[Bug 288689] dns/dnsmasq: test config before restart
bugdnstestconfigrestart