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ephemeral port wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 range 2 configuration characteristics 3 see also 4 notes 5 references 6 external links toggle the table of contents ephemeral port 6 languages español 日本語 한국어 lietuvių русский 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia short lived transport protocol port for ip communications an ephemeral port is a communications endpoint port of a transport layer protocol of the internet protocol suite that is used for only a short period of time for the duration of a communication session such short lived ports are allocated automatically within a predefined range of port numbers by the ip stack software of a computer operating system the transmission control protocol tcp the user datagram protocol udp and the stream control transmission protocol sctp typically use an ephemeral port for the client end of a client server communication at the server end of the communication session ephemeral ports may also be used for continuation of communications with a client that initially connected to one of the services listening with a well known port for example the trivial file transfer protocol tftp 1 and remote procedure call rpc applications can behave in this manner the allocation of an ephemeral port is temporary and only valid for the duration of the communication session after completion of the session the port is destroyed and the port number becomes available for reuse but many implementations simply increment the last used port number until the ephemeral port range is exhausted when the numbers roll over ephemeral ports are also called dynamic ports because they are used on a per request basis and are only known by number once allocated range edit range operating system 49152 65535 suggested by rfc 6335 and the internet assigned numbers authority iana for dynamic or private ports 2 3 freebsd has used the iana port range since release 4 6 windows vista windows 7 and server 2008 and subsequent versions including windows 11 use the iana range by default 4 32768 60999 used by many linux kernels note 1 5 32768 65535 used by solaris os 6 and aix os 7 1024 65535 rfc 6056 8 1025 60000 default of windows server 2008 with exchange server 2007 installed 9 in addition to the default range all versions of windows since windows 2000 have the option of specifying a custom range anywhere within 1025 65535 10 11 1024 5000 freebsd versions before 4 6 including the berkeley software distribution bsd 12 13 default range of microsoft windows operating systems through windows xp 14 1025 5000 used by windows server 2003 until microsoft security update ms08 037 from 2008 is installed after which it uses the iana range by default 15 configuration characteristics edit if certain server software is used that uses non ephemeral custom port ranges for initiating some further connections it needs to be ensured by configuration that this custom port range and the ephemeral port range do not overlap citation needed see also edit registered port list of tcp and udp port numbers notes edit the effective range is accessible via procfs at node proc sys net ipv4 ip_local_port_range references edit karen r sollins july 1992 the tftp protocol revision 2 ietf doi 10 17487 rfc1350 rfc 1350 retrieved 2020 10 18 iana port number assignments cotton m eggert l touch j westerlund m cheshire s august 2011 port number ranges internet assigned numbers authority iana procedures for the management of the service name and transport protocol port number registry ietf sec 6 doi 10 17487 rfc6335 rfc 6335 retrieved november 14 2021 the dynamic ports also known as the private or ephemeral ports 49152 65535 never assigned microsoft kb article 929851 ip sysctl the linux kernel documentation retrieved 2021 06 27 the default values are 32768 and 60999 respectively setting udp and tcp kernel parameters manually oracle database documentation oracle retrieved 15 september 2026 ephemeral ports ibm documentation ibm retrieved 15 september 2026 m larsen f gont january 2011 recommendations for transport protocol port randomization ietf sec 3 2 ephemeral port number range rfc 6056 however ephemeral port selection algorithms should use the whole range 1024 65535 microsoft kb article 929851 microsoft kb article 929851 microsoft kb article 196271 unix network programming volume 1 second edition networking apis sockets and xti prentice hall 1998 pp 42 43 isbn 0 13 490012 x mike gleason 2001 the ephemeral port range retrieved 2018 01 15 note that the linux 2 4 kernel will default the range of 32768 through 61000 if adequate kernel memory is available microsoft windows technet library microsoft kb article 956188 external links edit look up ephemeral in wiktionary the free dictionary rfc 6056 recommendations for transport protocol port randomization the ephemeral port range at ncftp com ephemeral source port selection strategies at dataplane org retrieved from https en wikipedia org w index php title ephemeral_port oldid 1375094633 categories internet standards internet protocols hidden categories articles with short description short description matches wikidata all articles with unsourced statements articles with unsourced statements from june 2020 this page was last edited on 15 september 2026 at 21 09 utc page 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