AddIPOffset adds the provided integer offset to a base big.Int representing a net.IP NOTE: If you started with a v4 address and overflow it, you get a v6 result.

BigForIP creates a big.Int based on the provided net.IP.

copyHeader copies headers from one http.Header to another.

get public ip of this host use IP.String() to get a string */.

get public ip of this host use IP.String() to get a string dest ip:port */.

GetIndexedIP returns a net.IP that is subnet.IP + index in the contiguous IP space.

use IP.String() to get a string.

destination: ip:port */.

ParseCIDRs parses a list of cidrs and return error if any is invalid.

ParsePort parses a string representing an IP port.

ParsePortRange parses a string of the form "min-max", inclusive at both ends, and initializes a new PortRange from it.

RangeSize returns the size of a range in valid addresses.

IPPortVar is used for validating a command line option that represents an IP and a port.

IPVar is used for validating a command line option that represents an IP.

PortRange represents a range of TCP/UDP ports.

PortRangeVar is used for validating a command line option that represents a port range.