Octet Network Toolkit

Octet Network Toolkit is an all-in-one network diagnostics toolkit for network engineers, infrastructure teams and learners. From subnet math to live diagnostics, everything you need in the field is in one app. ■ Calculators (on-device, free) ・IPv4 subnet calculator: CIDR / subnet mask / broadcast / host range / binary view / subnet splitting ・IPv6 calculator: compressed and expanded forms / address count / EUI-64 generation ・Tap any result to copy it ■ Diagnostic tools ・DNS lookup (A/AAAA/MX/TXT and more), reverse lookup (PTR), whois ・SSL certificate check (chain, expiry, cipher suite), HTTP headers ・Public IP lookup ・ping (reachability and RTT), traceroute (path tracing) ・TCP port scan, LAN device scan (Bonjour), Wake-on-LAN ・MAC vendor lookup (offline OUI database) ■ Privacy first ・No account required ・No ads, no tracking ・Subnet calculations run entirely on your device (Diagnostic tools, by their nature, communicate with the targets you specify and servers along the network path.) ■ Octet Pro Unlock all diagnostic tools, unlimited history, iCloud history sync across devices, and SSL certificate expiry reminders. Choose a monthly subscription or a one-time purchase (Universal Purchase: buy once, use on iPhone, iPad and Mac). Available in English and Japanese — choose your language on first launch or anytime in Settings. The diagnostic features are intended for use on systems you are authorized to test and for legitimate purposes. Please comply with the target system's terms of use, your organization's policies and applicable laws.