dig exits 0 on SERVFAIL and 9 when no resolver answers. A check that only greps for NXDOMAIN calls both fine. Mine said OK to 41 of 41 hosts. https://dev.to/posting-dude/my-dns-check-script-said-ok-f

dev.to Linux2026-11-13 13:290 views

My DNS Check Script Said OK for 41 of 41 Hostnames. 22 of Them Don't Exist.

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