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Port 443 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
443 tcp HTTPS HTTPS / SSL - encrypted web traffic, also used for VPN tunnels over HTTPS.

Apple applications that use this port: Secured websites, iTunes Store, FaceTime, MobileMe (authentication) and MobileMe Sync.

ASUS AiCloud routers file sharing service uses ports 443 and 8082. There is a vulnerability in AiCloud with firmwares prior to , see [CVE-2013-4937]

Ubiquiti UniFi Cloud Access uses ports 443 TCP/UDP, 3478 UDP, 8883 TCP.

SoftEther VPN (Ethernet over HTTPS) uses TCP Ports 443, 992 and 5555

Ooma VoIP - uses UDP port 1194 (VPN tunnel to the Ooma servers for call/setup control), ports 49000-50000 for actual VoIP data, and ports TCP 443, UDP 514, UDP 3480

Open Mobile Alliance (OMA) Device Management uses port 443/TCP.

Cisco Webex Teams services uses these ports:
443,444,5004 TCP
53, 123, 5004, 33434-33598 UDP (SIP calls)

Syncthing listens on TCP ports 443, 22067, 22070

AnyDesk remote desktop software uses TCP ports 80, 443, 6568, 7070 (direct line connection)

Call of Duty World at War uses this port.

Trojans that use this port:
W32.Kelvir.M [Symantec-2005-040417-3944-99] (2005.04.04) - worm that spreads through MSN Messanger and drops a variant of the W32.Spybot.Worm [Symantec-2003-053013-5943-99]. Connects to IRC servers on the and domains, and listens for commands on port 443/tcp.

Directory traversal vulnerability in Cisco Network Admission Control (NAC) Manager 4.8.x allows remote attackers to read arbitrary files via crafted traffic to TCP port 443, aka Bug ID CSCtq10755.
References: [CVE-2011-3305] [BID-49954]

Multiple buffer overflows in the authentication functionality in the web-server module in Cisco CiscoWorks Common Services before 4.0 allow remote attackers to execute arbitrary code via a session on TCP port (1) 443 or (2) 1741, aka Bug ID CSCti41352.
References: [CVE-2010-3036] [BID-44468] [SECUNIA-42011] [OSVDB-68927]

Buffer overflow in the logging functionality of the HTTP server in IBM Tivoli Provisioning Manager for OS Deployment (TPMfOSD) before Interim Fix 3 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via an HTTP request with a long method string to port 443/tcp.
References: [CVE-2008-0401] [BID-27387] [SECUNIA-28604]

The administrative web interface on Cisco TelePresence Immersive Endpoint Devices before 1.7.4 allows remote authenticated users to execute arbitrary commands via a malformed request on TCP port 443, aka Bug ID CSCtn99724.
References: [CVE-2012-3075]

Cisco Identity Services Engine (ISE) 1.x before 1.1.1 allows remote attackers to bypass authentication, and read support-bundle configuration and credentials data, via a crafted session on TCP port 443, aka Bug ID CSCty20405.
References: [CVE-2013-5531]

The web framework in Cisco Identity Services Engine (ISE) 1.0 and 1.1.0 before, 1.1.1 before, 1.1.2 before, 1.1.3 before, 1.1.4 before, and 1.2 before allows remote authenticated users to execute arbitrary commands via a crafted session on TCP port 443, aka Bug ID CSCuh81511.
References: [CVE-2013-5530]

Siemens SCALANCE S613 allows remote attackers to cause a denial of service (web-server outage) via traffic to TCP port 443.
References: [CVE-2016-3963]

Siemens SIMATIC S7-1200 is vulnerable to a denial of service, caused by an error when handling specially-crafted HTTPS traffic passed to TCP port 443. By sending specially-crafted packets to TCP port 443, a remote attacker could exploit this vulnerability to cause the device to go into defect mode.
References: [CVE-2014-2258] [XFDB-92059]

A vulnerability was discovered in Siemens OZW672 (all versions) and OZW772 (all versions) that could allow an attacker to read and manipulate data in TLS sessions while performing a man-in-the-middle (MITM) attack on the integrated web server on port 443/tcp.
References: [CVE-2017-6873], [BID-99473]

A vulnerability was discovered in Siemens ViewPort for Web Office Portal before revision number 1453 that could allow an unauthenticated remote user to upload arbitrary code and execute it with the permissions of the operating-system user running the web server by sending specially crafted network packets to port 443/TCP or port 80/TCP.
References: [CVE-2017-6869], [BID-99343]

A vulnerability has been identified in SCALANCE X300 (All versions < V4.0.0), SCALANCE X408 (All versions < V4.0.0), SCALANCE X414 (All versions). The web interface on port 443/tcp could allow an attacker to cause a Denial-of-Service condition by sending specially crafted packets to the web server. The device will automatically reboot, impacting network availability for other devices. An attacker must have network access to port 443/tcp to exploit the vulnerability. Neither valid credentials nor interaction by a legitimate user is required to exploit the vulnerability. There is no confidentiality or integrity impact, only availability is temporarily impacted. This vulnerability could be triggered by publicly available tools.
References: [CVE-2018-13807], [BID-105331]

An issue was discovered in SecurePoint UTM before The firewall's endpoint at /spcgi.cgi allows information disclosure of memory contents to be achieved by an authenticated user. Essentially, uninitialized data can be retrieved via an approach in which a sessionid is obtained but not used.
References: [CVE-2023-22897]

An issue was discovered in SecurePoint UTM before The firewall's endpoint at /spcgi.cgi allows sessionid information disclosure via an invalid authentication attempt. This can afterwards be used to bypass the device's authentication and get access to the administrative interface.
References: [CVE-2023-22620]
443 udp games Port used by Google talk.
Games that use this port: Final Fantasy XI
443 tcp,udp Hypertext Transfer Protocol over TLS/SSL (HTTPS) (official) Wikipedia
443 tcp trojan Slapper Trojans
443 tcp https HTTP protocol over TLS SSL SANS
443,1024-5000,5190 tcp,udp applications AIM Video IM Portforward
80,443 tcp applications BarracudaDrive Portforward
80, 443, 1024-1124, 4711, 9960-9969, 17475, 18060, 18120, 18300, 18510, 27900, 28910, 29900 tcp applications Battlefield 2142 Portforward
80,443,3074,5223 tcp applications Call of Duty - World at War Portforward
443 tcp,udp applications FileTopia Portforward
443,13505 udp applications Medal of Honor Rising Sun Portforward
80,443,5223 tcp applications PlayStation Network Portforward
53,80,443,10070-10080 tcp applications Socom, Socom 2. Also uses ports 6000-6999,10070 udp Portforward
53,80,443,10070,10080 tcp applications Twisted Metal Black Online (also uses ports 6000-6999 udp) Portforward
443 tcp https secure http (SSL) Nmap
443 udp https https Nmap
443 tcp,udp https HTTP protocol over TLS/SSL Neophasis
443 tcp threat Civcat Bekkoame
443 tcp threat Tabdim Bekkoame
443 tcp threat W32.Kelvir Bekkoame
443 tcp threat W32.Kiman Bekkoame
443 tcp,udp https http protocol over TLS/SSL, modified: 2017-07-26 IANA
443 sctp https HTTPS [RFC4960] IANA
23 records found
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Related ports: 444  992  1741  3074  3075  3478  3479  4443  5223  5555  8082  8883  9443  10443  25  110  5222  

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External Resources
SANS Internet Storm Center: port 443

Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol, the most commonly used protocol on the Internet and any TCP/IP network. TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.

UDP ports use the Datagram Protocol. Like TCP, UDP is used in combination with IP (the Internet Protocol) and facilitates the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming and realtime gaming, where dropping some packets is preferable to waiting for delayed data.

When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

Please use the "Add Comment" button below to provide additional information or comments about port 443.
  User Reviews/Comments:
by Stu53848 - 2019-01-31 21:59
Noticed also that Data being forwarded to Bootstrapping is what this company call it. I gave more information to Forward
by cmcqueen - 2021-11-24 18:32
Please add 8443 as a related port, since 8443 is a "common alternative HTTPS port".
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