Available tools

• IPv4 Subnet Calculator Network, broadcast, host range, mask, and binary breakdown from CIDR or dotted mask.
• What's My IP Detect your public IPv4 and IPv6 addresses as seen from the internet.
• WHOIS Lookup Domain and IP WHOIS — registration dates, nameservers, network range, and contacts.
• SSL/TLS Certificate Checker Inspect a host's certificate — issuer, expiry, days remaining, SANs, and chain.
• IPv6 Subnet Calculator Network, first/last address, address count, type, and reverse DNS from a prefix.
• CIDR Aggregator Merge overlapping and adjacent IPv4/IPv6 networks into the minimal set of prefixes.
• DNS Lookup Query A, AAAA, MX, NS, TXT, CNAME, SOA, PTR, CAA, and SRV records over DNS-over-HTTPS.
• MAC Address Formatter & Vendor Lookup Convert a MAC between colon, hyphen, Cisco dotted, and bare notation, identify the vendor (OUI), and see cast and U/L details.
• Base Converter Convert between binary, octal, decimal, hex, and arbitrary bases with byte breakdown.
• Cisco Config Helpers Wildcard ↔ subnet mask converter, an IOS access-list line builder, and a VLSM subnet planner.