Kostenlose Tools

Network tools

IP addressing, subnets, MAC addresses, ports and bandwidth.

Network

IPv4 Subnet Calculator

Network, broadcast, usable host range, wildcard mask and binary view for any IPv4 address and CIDR prefix.

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IPv6 Subnet Calculator

Prefix range, number of addresses and /64 networks, and a list of subnets when you split a delegation.

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IPv6 Address Converter

Expand or compress any IPv6 address and see it as binary, decimal, hex groups and an ip6.arpa reverse DNS name – or turn a decimal number back into IPv6.

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IPv6 Address Validator

Check whether an IPv6 address is valid and find out what kind it is – global unicast, link-local, unique local, multicast, documentation, IPv4-mapped and more.

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IPv6 Cheat Sheet

IPv6 address types, special prefixes and prefix sizes on one page – a quick reference for planning and troubleshooting.

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MAC Address Converter

Reformat a MAC address for Windows, Linux or Cisco, check its unicast/multicast and local/global bits, and derive the EUI-64 IPv6 link-local address.

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IPv4 Address Converter

Convert an IPv4 address to decimal, hex, binary, octal and its IPv4-mapped IPv6 form – and back.

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Bandwidth & Transfer Time Calculator

How long will a backup, upload or migration take? Enter the size and link speed – with a realistic overhead allowance.

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TCP/UDP Port Lookup

Search the well-known ports used by mail, web, remote access, databases, Windows domains and VoIP – with protocol and firewall notes.

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