152 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Email deliverability & domain security check — validates SPF, DKIM (multi-selector), and DMARC, detects spoofing and misconfigurations, and returns an A–F email security grade with transparent deductions. Anti-spam / ant...
Bandwidth of a VoIP call (IP and Ethernet level) for a codec and packetization time, and totals for many calls.
Cron expression explained in plain English with the next run times in any time zone - validates a 5-field cron and handles DST
IPv4/IPv6 subnet calculator: network, mask, wildcard, broadcast, first/last host, usable hosts, address type (private, public, loopback...) and whether a given IP belongs to the subnet.
Check the TLS certificate a domain serves on port 443: whether it chains to a trusted root, matches the name (RFC 9525) and when it expires, with issuer, chain, key and signature algorithm, TLS version and coded findings...
Parse an IPv4 CIDR block: network address, broadcast, first/last host, netmask, and host count. Optionally test if an IP is inside it.
CIDR calculator. Details of an IPv4 network in CIDR notation: network and broadcast address, first and last usable host, netmask, number of addresses, and whether a given IP falls inside. Use for firewall rules and allow...
Resolve ENS (.eth) on Ethereum and Basenames (.base.eth) on Base, forward or reverse. Returns address, name, source, forward_verified, optional avatar.
Check whether an IP is inside a CIDR network for $0.001 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover...
Parse and classify an IPv4/IPv6 address (private, loopback, CGNAT, documentation, ...). Canonical and expanded forms, integer and hex values, version, scope per the IANA special-purpose registries (private, loopback, lin...
CIDR / subnet calculator: network and broadcast address, first and last usable host, netmask and wildcard mask, total and usable address counts for any IPv4 CIDR block. Network planning and validation. $0.01 per calculat...
IP range to CIDR converter: turns any IPv4 start-end range into the minimal list of CIDR blocks that cover it exactly, with the address count. Firewall and allowlist preparation. $0.01 per range.
Is the IPv4 address inside 104.16.0.0/12 (Cloudflare edge)? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known block....
Is the IPv4 address inside 172.64.0.0/13 (Cloudflare edge)? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known block....
Is the IPv4 address inside 1.1.1.0/24 (Cloudflare DNS)? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known block. $0....
Is the IPv4 address inside 8.8.8.0/24 (Google Public DNS)? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known block....
Is the IPv4 address inside 8.8.4.0/24 (Google Public DNS)? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known block....
Is the IPv4 address inside 9.9.9.0/24 (Quad9 DNS)? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known block. $0.01 pe...
Is the IPv4 address inside 208.67.222.0/24 (OpenDNS)? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known block. $0.01...
Is the IPv4 address inside 52.0.0.0/8 (Amazon (large block))? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known bloc...
Is the IPv4 address inside 3.0.0.0/8 (Amazon (large block))? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known block...
Is the IPv4 address inside 18.0.0.0/8 (Amazon (large block))? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known bloc...
Is the IPv4 address inside 54.0.0.0/8 (Amazon (large block))? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known bloc...
Is the IPv4 address inside 34.0.0.0/8 (Google Cloud (large block))? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-know...