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Internet & Network Tools

The speed test times the path you are on. Everything else in this list is arithmetic or a fixed table: download time, data use, uptime, ports, MAC bits, CIDR overlap, IPv4 spellings and punycode. DNS lookups live with the developer tools and say so when they leave the device.

12 tools · free · no account

IP Subnet CalculatorNewIP subnet calculator for IPv4 and IPv6: network, broadcast, host range, mask and wildcard from any CIDR, plus subnetting, VLSM and route summarisation.Internet Speed TestNewCheck download and upload speed, ping, jitter and bufferbloat on Wi-Fi, broadband or mobile data — no app, with a data saver mode.Download Time CalculatorNewDownload Time Calculator on Toolspire: Work out how long a file takes at a megabit link speed, using decimal bytes and one million bits per second.Data Usage CalculatorNewData Usage Calculator on Toolspire: Turn a steady megabit rate and the hours you use it into gigabytes. One megabit is one million bits a second.Uptime CalculatorNewUptime Calculator on Toolspire: Turn an availability percent such as 99.9 into downtime for a day, a 30-day month and a 365-day year. It is arithmetic.Port Number LookupNewPort Number Lookup on Toolspire. Look up a well-known TCP or UDP port, or a service name such as SSH, HTTPS or MySQL, from a fixed list. No host is scanned.MAC Address GeneratorNewMAC Address Generator on Toolspire. Check a MAC address, name the unicast and local-admin bits. No account is required.CIDR Overlap CheckerNewCIDR Overlap Checker on Toolspire. Compare two IPv4 CIDR prefixes and report whether one contains the other, they are the same range, or they are disjoint.IPv4 Address ConverterNewIPv4 Address Converter on Toolspire: Convert an IPv4 address between dotted decimal, a 32-bit integer, hexadecimal and dotted binary.Punycode ConverterNewPunycode Converter on Toolspire. Convert an international domain name to ASCII punycode and back, using the xn-- prefix from RFC 3492.IPv6 ExpanderNewIPv6 Expander on Toolspire: Expand a compressed IPv6 address to eight groups of four hex digits. 2001:db8::1 becomes 2001:0db8:0000:0000:0000:0000:0000:0001.Wildcard Mask CalculatorNewTurn an IPv4 prefix length into a subnet mask and the Cisco-style wildcard, which is the mask with the bits flipped. /26 is mask 255.255.255.192.

FAQ

Internet & Network Tools: common questions

What belongs in Internet & Network Tools on Toolspire?

Internet & Network Tools is one collection on justtools.info. Open any tool and the page tells you whether the work stays on your device or a public lookup is required.

Do I need to install anything?

No. The network tools run in the browser. The speed test is the one that uses your connection. The calculators, the port list and the address tools stay on this device.

Where are the DNS tools?

The DNS Lookup and DNS Propagation Checker are with the developer tools.

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