Every IPv4Scanner guide tagged security. All posts »
2026-10-03 · IPv4Scanner · 6 min read
DoH and DoT both encrypt DNS lookups. What each one hides, what it leaves exposed, how they differ on ports and blocking, and how to test that yours works.
2026-09-26 · IPv4Scanner · 4 min read
What open, closed and filtered ports actually mean, how to check a port from outside your network, and which ports you never want exposed.