code: func (t *Target) network() string {
  	version := 4
  	if t.IP.To4() == nil {
  		version = 6
  	}
  
  	var network string
  	switch t.Proto {
  	case seesaw.IPProtoICMP:
  		network = "ip4:icmp"
  	case seesaw.IPProtoICMPv6:
  		network = "ip6:ipv6-icmp"
  	case seesaw.IPProtoTCP:
  		network = fmt.Sprintf("tcp%d", version)
  	case seesaw.IPProtoUDP:
  		network = fmt.Sprintf("udp%d", version)
  	default:
  		return "(unknown)"
  	}
  
  	return network
  }
docs: // network returns the network name for the healthcheck target.