Tools

Whois query

The whois service supplies information on the owners of IP addresses and domain names.

This shows the IP address from which your browser is accessing this website; this is either the address of your computer, your router or your proxy.

This tool shows the route taken by IP packets between heise-online.co.uk and any IP address or host name that you provide.

The DNS query provides the IP address of a computer, plus much additional information.

This computes subnet masks, broadcast addresses or CIDR suffixes for an IPv4 subnet. Also the smallest common subnet for two IPv4 addresses.

This tool determines the manufacturer of your network adaptor, once you enter the adaptor MAC address.

full text search and direct access to all current requests for comments regarding internet standards and other issues.

The ping tool checks the availability of a computer on a network from www.heise-online.co.uk.

Tells you if there enough free capacity for your file-sharing and other bandwidth intense applications.

This enables you to check whether an email address is on one of the blacklists used by spam blockers.

an overview of all reserved IPv4 addresses.