Free Browser Tool Checks IPv6 and Dual-Stack Status of Your Network Instantly

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A developer has released a free, no-signup browser tool that tests whether a network supports IPv6, dual-stack connectivity, and reveals associated ISP and latency details. The tool, available at 17nas.com, displays both IPv4 and IPv6 addresses simultaneously, helping users discover if they are behind carrier-grade NAT without a public IP. IPv4 address exhaustion has pushed many ISPs toward CGNAT, which can silently disrupt self-hosting, peer-to-peer applications, and remote server access. The tool works by fetching small assets over IPv4 and IPv6 in parallel from dual-stack endpoints, reporting only what the network can actually reach. It is part of 17NAS, a small collection of free network diagnostic utilities that also includes a NAT type test and a timezone checker.

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ProgrammingDEV Community ·

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