← Port Encyclopedia
857

Port-857

TCP
System Low Risk
Reserved or unassigned port 857 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 857

nmap -sV -p 857 target
nmap -sV -sC --script=banner -p 857 target
nc -zv target 857

🛡️ Security Considerations

  • Scan port 857 with nmap -sV to identify the exact service and version
  • If Port-857 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-857 to find known exploits
  • Monitor traffic on port 857 with Wireshark or tcpdump for anomalies
  • Ensure the service is patched to the latest version to prevent known CVE exploitation

🔗 Related System Ports

Port 1
TCPMUX
Port 5
RJE
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Echo
Port 9
Discard
Port 11
systat
Port 13
Daytime
Port 17
QOTD
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Chargen
Port 37
Time
Port 79
Finger
Port 111
RPCbind
Port 113
Ident

📍 Nearby Ports

Port 852
Port-852
Port 853
Port-853
Port 854
Port-854
Port 855
Port-855
Port 856
Port-856
Port 858
Port-858
Port 859
Port-859
Port 860
Port-860
Port 861
Port-861
Port 862
Port-862
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