code: func (h *Hostsfile) LookupStaticAddr(addr string) []string {
  	h.RLock()
  	defer h.RUnlock()
  	addr = parseLiteralIP(addr).String()
  	if addr == "" {
  		return nil
  	}
  	if len(h.hmap.byAddr) != 0 {
  		if hosts, ok := h.hmap.byAddr[addr]; ok {
  			hostsCp := make([]string, len(hosts))
  			copy(hostsCp, hosts)
  			return hostsCp
  		}
  	}
  	return nil
  }
docs: // LookupStaticAddr looks up the hosts for the given address from the hosts file.