code: func (h *Hostsfile) LookupStaticHostV4(host string) []net.IP {
  	h.RLock()
  	defer h.RUnlock()
  	if len(h.hmap.byNameV4) != 0 {
  		if ips, ok := h.hmap.byNameV4[absDomainName(host)]; ok {
  			ipsCp := make([]net.IP, len(ips))
  			copy(ipsCp, ips)
  			return ipsCp
  		}
  	}
  	return nil
  }
docs: // LookupStaticHostV4 looks up the IPv4 addresses for the given host from the hosts file.