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Check connection

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Network tools that keep what they see to themselves.

IP geolocation by DB-IP

Tools

IP Address Lookup DNS Leak Test Browser Check HTTP Headers Port Check Ping SSL/TLS Checker DNS Lookup Mail Check WHOIS Lookup Subnet Calculator MAC Address Lookup

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IP lookup
DNS leak test
Browser check
HTTP headers
Port check
Ping
SSL checker
DNS lookup
Mail check
WHOIS
Subnet calculator
MAC lookup

How big is your subnet?

Network, broadcast, host range and mask for IPv4 and IPv6, and how to split it. Calculated in your browser.

Address with prefix or netmask

Try

Enter an address with a prefix like 192.168.1.0/24, or with a netmask like 10.0.0.1 255.255.0.0.

What we pass on

Nothing.

The calculation runs in your browser. Not even our server sees what you enter.

skyping.chown

From your terminal

$ curl "skyping.ch/subnet?cidr=192.168.1.0/24"

About this check

/31 and /32 have no network and broadcast address (RFC 3021), so all their addresses are usable.
IPv6 has no broadcast. A LAN always gets a /64, however many devices it has.