{ "x402Version": 2, "id": 29586, "slug": "29586", "resource": "https://netintel.dev/subnet/calc", "description": "Calculates IPv4/IPv6 subnet details from CIDR notation — network/broadcast, netmask, wildcard (Cisco ACL) mask, binary/hex masks, usable host range, RFC classification (private/loopback/multicast), supernet, and subnet-split counts. 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