Network related utility/library that handles network related information thas is not pure communication.
Network 6.1.x is an extraction and refactored module that recently was deployed with the netcurl package. The breakout has been made, mainly to make it easier to maintain network functions without destroying functions in netcurl, when it's not necessary.
The module contains - mostly - action points that don't necessarily needs the communication parts from netcurl.
PHP 5.5 or higher. It might work in lower versions, but since the test suites no longer accept 5.4 this is not officiall supported either.