Network Tools
7 free tools. No account required, no rate limits.
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Subnet Calculator
IPv4 CIDR subnetting — network address, broadcast, host range, wildcard mask
IPv4CIDRSubnetting
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DNS & Network SuperTool
DNS records, SPF, DMARC, DKIM, WHOIS, HTTP headers, ASN, blacklist check and more
DNSEmailBlacklist
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WHOIS Lookup
Domain registration info, nameservers, registrar, and expiry dates via RDAP
RDAPDomainsIP blocks
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IP Geolocation
Country, city, ISP, ASN, coordinates, timezone — includes your own IP
GeolocationASNISP
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Port Scanner
TCP connect scan — check open ports on any host with presets or custom lists
TCPPortsFirewall
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Ping
Test host reachability and round-trip latency with 4 probes
LatencyRTTReachability
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MAC Address Lookup
Identify network device manufacturer from any MAC address via OUI database
OUIIEEEVendor