Every IPv4Scanner guide tagged ports. All posts »
2026-10-18 · IPv4Scanner · 6 min read
How NAT lets a whole household share one IPv4 address, why it blocks incoming connections, and what port forwarding, UPnP and CGNAT actually change.
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.