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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package net
// TCPAddr represents the address of a TCP end point.
type TCPAddr struct {
Port int
Zone string // IPv6 scoped addressing zone
// Network returns the address's network name, "tcp".
func (a *TCPAddr) Network() string { return "tcp" }
func (a *TCPAddr) String() string {
if a == nil {
return "<nil>"
ip := ipEmptyString(a.IP)
if a.Zone != "" {
return JoinHostPort(ip+"%"+a.Zone, itoa(a.Port))
return JoinHostPort(ip, itoa(a.Port))
func (a *TCPAddr) isWildcard() bool {
if a == nil || a.IP == nil {
return true
return a.IP.IsUnspecified()
func (a *TCPAddr) opAddr() Addr {
if a == nil {
return nil
return a
// ResolveTCPAddr parses addr as a TCP address of the form "host:port"
// or "[ipv6-host%zone]:port" and resolves a pair of domain name and
// port name on the network net, which must be "tcp", "tcp4" or
// "tcp6". A literal address or host name for IPv6 must be enclosed
// in square brackets, as in "[::1]:80", "[ipv6-host]:http" or
// "[ipv6-host%zone]:80".
func ResolveTCPAddr(net, addr string) (*TCPAddr, error) {
switch net {
case "tcp", "tcp4", "tcp6":
case "": // a hint wildcard for Go 1.0 undocumented behavior
net = "tcp"
return nil, UnknownNetworkError(net)
addrs, err := internetAddrList(net, addr, noDeadline)
if err != nil {
return nil, err
return addrs.first(isIPv4).(*TCPAddr), nil