# Dictionary of common ports and their service names
service_names = {
  21: "FTP",
  22: "SSH",
  23: "Telnet",
  25: "SMTP",
  53: "DNS",
  80: "HTTP",
  110: "POP3",
  143: "IMAP",
  443: "HTTPS",
  3306: "MySQL",
  5432: "PostgreSQL",
  6379: "Redis",
  8080: "HTTP Alternative",
}