Enter up to 10 CIDRs or IPs (one per line, or comma/space separated) to check overlap and containment. IPv4 and IPv6 supported.
MTU / MSS for VPN
Enter your path MTU (default 1500) to compute tunnel MTU and TCP MSS for WireGuard and common IPsec profiles. Overhead assumptions are shown with the result.
Email Validator
Enter up to 10 email addresses (one per line, or comma/space separated) for syntax, DNS and MX checks. The live SMTP check is limited to 5 addresses per request (and 10 per hour), because asking real mail servers whether a mailbox exists is how address lists get harvested.
