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DNSMonitor vs DNSQuerySniffer: catalog facts
DNSMonitor	DNSQuerySniffer
Free Free and open source under the GPL-3.0 licence.	Free Freeware from NirSoft; it may not be sold or bundled with commercial products.
macOS, Command line	Windows
Shows DNS lookups made by software on the Mac Built on Apple's Network Extension framework	Shows every DNS query with response records and timing Highlights failed and unanswered lookups
Command-line only, with no graphical interface macOS only	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
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License: Freeware
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 2, 2026	Official website Full listing and sources Checked October 8, 2026

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