var net.IPv4zero

9 uses

	net (current package)
		ip.go#L105: 	IPv4zero      = IPv4(0, 0, 0, 0)         // all zeros
		ip.go#L121: 	return ip.Equal(IPv4zero) || ip.Equal(IPv6unspecified)
		ipsock.go#L297: 		ips = append(ips, IPAddr{IP: IPv4zero})
		ipsock_posix.go#L147: 		ip = IPv4zero
		ipsock_posix.go#L169: 	if len(ip) == 0 || ip.Equal(IPv4zero) {
		sock_posix.go#L228: 				addr.IP = IPv4zero
		sockopt_posix.go#L46: 	if ip.Equal(IPv4zero) {
		sockopt_posix.go#L54: 		return IPv4zero, nil
		sockopt_posix.go#L98: 	if bytealg.Equal(mreq.Multiaddr[:], IPv4zero.To4()) {

The pages are generated with Golds v0.6.7. (GOOS=linux GOARCH=amd64)
Golds is a Go 101 project developed by Tapir Liu.
PR and bug reports are welcome and can be submitted to the issue list.
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