TCP/UDP Port Finder

Enter port number (e.g. 21), service (e.g. ssh, ftp) or threat (e.g. nimda)
Database updated - August 26, 2014

Search results for "vpn"

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Port: 256/TCP
256/TCP - Known port assignments (5 records found)
  • Service
    Details
    Source
  • rap
    RAP
    IANA
  • fw1-sync
    Checkpoint Firewall-1 state table sync
    SANS
  • rap
    -
    SANS
  • threat
    [threat] FW1 Certificate/key distribution. VPN clients (SecuRemote) can download keys on this port.
    Bekkoame
  • threat
    [threat] SpBot
    Bekkoame
Port: 259/UDP
259/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  • esro-gen
    Efficient Short Remote Operations
    IANA
  •  
    ESRO, Efficient Short Remote Operations (Official)
    WIKI
  • cp-config
    Check Point FW-1 Nokia P-1 VPN-1
    SANS
Port: 500/TCP
500/TCP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • isakmp
    isakmp
    IANA
  • isakmp
    VPN Key Exchange
    SANS
Port: 500/UDP
500/UDP - Known port assignments (5 records found)
  • Service
    Details
    Source
  • isakmp
    isakmp
    IANA
  •  
    Internet Security Association and Key Management Protocol (ISAKMP) (Official)
    WIKI
  • isakmp
    VPN Key Exchange
    SANS
  • isakmp
    ISAKMP/IKE. Mac OS X Server VPN service, Back to My Mac (MobileMe, Mac OS X v10.5 or later).
    Apple
  • threat
    [threat] Cisco Systems
    Bekkoame
Port: 1224/TCP
1224/TCP - Known port assignments (1 record found)
  • Service
    Details
    Source
  • vpnz
    VPNz
    IANA
Port: 1224/UDP
1224/UDP - Known port assignments (1 record found)
  • Service
    Details
    Source
  • vpnz
    VPNz
    IANA
Port: 1701/UDP
1701/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  • l2tp
    l2tp
    IANA
  •  
    Layer 2 Forwarding Protocol (L2F) & Layer 2 Tunneling Protocol (L2TP) (Official)
    WIKI
  • l2f
    L2TP. Mac OS X Server VPN service
    Apple
Port: 1723/TCP
1723/TCP - Known port assignments (4 records found)
  • Service
    Details
    Source
  • pptp
    pptp
    IANA
  •  
    Microsoft Point-to-Point Tunneling Protocol (PPTP) (Official)
    WIKI
  • pptp
    Point-to-point tunnelling protocol
    SANS
  • pptp
    PPTP. Mac OS X Server VPN service
    Apple
Port: 3694/TCP
3694/TCP - Known port assignments (2 records found)
  • Service
    Details
    Source
  •  
    Unassigned
    IANA
  • vpntpp
    VPN Token Propagation Protocol
    Bekkoame
Port: 3694/UDP
3694/UDP - Known port assignments (2 records found)
  • Service
    Details
    Source
  •  
    Unassigned
    IANA
  • vpntpp
    VPN Token Propagation Protocol
    Bekkoame
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About TCP/UDP ports

TCP port 256 uses the Transmission Control Protocol. TCP is one of the main protocols in TCP/IP networks. TCP is a connection-oriented protocol, it requires handshaking to set up end-to-end communications. Only when a connection is set up user's data can be sent bi-directionally over the connection.
Attention! TCP guarantees delivery of data packets on port 256 in the same order in which they were sent. Guaranteed communication over TCP port 256 is the main difference between TCP and UDP. UDP port 256 would not have guaranteed communication as TCP.
UDP on port 256 provides an unreliable service and datagrams may arrive duplicated, out of order, or missing without notice. UDP on port 256 thinks that error checking and correction is not necessary or performed in the application, avoiding the overhead of such processing at the network interface level.
UDP (User Datagram Protocol) is a minimal message-oriented Transport Layer protocol (protocol is documented in IETF RFC 768).
Application examples that often use UDP: voice over IP (VoIP), streaming media and real-time multiplayer games. Many web applications use UDP, e.g. the Domain Name System (DNS), the Routing Information Protocol (RIP), the Dynamic Host Configuration Protocol (DHCP), the Simple Network Management Protocol (SNMP).
TCP vs UDP - TCP: reliable, ordered, heavyweight, streaming; UDP - unreliable, not ordered, lightweight, datagrams.
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