Originally developed for Windows 95, it reportedly runs on all Win32 platforms: Windows 98, Windows NT, ME, XP, now also ported to Mac OS X (so far only tested on Mountain Lion).Support for TFTP blocksize option allows transfer of large files if both TFTP server and client support it.Unlimited simultaneous transfers both for TFTP server and client.Fully standard-compliant TFTP file transfer.Note: this functionality is only implemented in windows version. The primary use of PumpKIN is maintenance of the network equipment (such as router firmware upgrade) that fetches images from TFTP server, although it is also useful for transfering files between parties involved in a conversation over ntalk connection using our T42 software (it also detects ntalk conversation held over now obsolete program 'wintalk').

It also implements block size option, which allows transfer of files over 32MB, as well as transfer size and transfer timeout options described in RFC2348 PumpKIN is an open source, fully functional, free TFTP server and TFTP client, which implements TFTP according to RFC1350

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