netutils

Don't forget add https:// or http.

Check connection to http/https server return nil if cant connect to server through interface */.

Get first finded IPv4 address of Linux network interface.

Check if Network Interface has any IPv4 address.

id is instance in mdns.

Check if host machine have internet (check by ping(imcp) to dns servers) */.

Check if host machine have internet (check http connection to DNS server ) */.

list all real network iface, include ethernet, wlan, docker network.

Convert Domain to IP */.

Check if server is alive, timeout check is 666ms */.

Stolen from https://godoc.org/golang.org/x/net/internal/iana, can't import "internal" packages.