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DNSQuerySniffer vs DNSMonitor: catalog facts
DNSQuerySniffer	DNSMonitor
Free Freeware from NirSoft; it may not be sold or bundled with commercial products.	Free Free and open source under the GPL-3.0 licence.
Windows	macOS, Command line
Shows every DNS query with response records and timing Highlights failed and unanswered lookups	Shows DNS lookups made by software on the Mac Built on Apple's Network Extension framework
Raw Sockets capture may not work on some systems without WinPcap or Network Monitor driver Timing is more accurate only with a capture driver installed	Command-line only, with no graphical interface macOS only
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: GPL-3.0
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.