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Here's a collection of on-line tools that I've written. Some of the tools are just plain wrappers for some Unix tools like ping and whois. Others actually are written by me like 'Reverse DNS block' and 'Graphics to Ascii'.

Network related utilities
:ping:   Standard Unix ping, nothing special here.
:traceroute:   Nanog-traceroute, can show AS and owner at each hop.
:whois:   Standard Unix whois.
:nmap:   Portscan a system. Unless you are logged on as a trusted member you can only scan yourself.
:dig:   Standard Unix dig
:finger:   Standard Unix finger
:reverse dns:   This tool takes an address and returns the names for all hosts within that /24-block.
:request headers:   View the request headers that are sent from you browser.
:http request:
  View the complete response from a web server
Electronic related utilities
:led calculator:   Calculate the correct resistors for your LEDs
Other utilities
:gfx2ascii:   Converts a GIF-picture to an ASCII-drawing in color.
::word search:   Searches for possible words given a partial string
:pdu convert:   Converts between PDU & ASCII-strings for SMS messages