Look up any port number in the IANA registry

Type a number, a range or a service name. All 6,091 numbers with an assignment are here, with their protocols, registry labels and dates.

443registered to https
ProtocolServiceLabelRegisteredModified
TCPhttpshttp protocol over TLS/SSL—Oct 1, 2021
UDPhttpshttp protocol over TLS/SSL—Oct 1, 2021
SCTPhttpsHTTPS—Feb 7, 2022
System Port (0–1023)Nearest assigned: 442 cvc-hostd below, 444 snpp aboveRead the port 443 page

Registry assignment as of October 26, 2026 (IANA, CC0). An assignment does not show what software actually uses the port.

The 65,536 numbers at a glance

Each bar is a block of 1,024 numbers. Assignments crowd the low end: the first block holds 686, while nothing above 49151 is assigned at all.

05001,0000–1023: 686 assigned1024–2047: 1011 assigned2048–3071: 1015 assigned3072–4095: 1006 assigned4096–5119: 532 assigned5120–6143: 391 assigned6144–7167: 249 assigned7168–8191: 253 assigned8192–9215: 207 assigned9216–10239: 164 assigned10240–11263: 50 assigned11264–12287: 38 assigned12288–13311: 14 assigned13312–14335: 32 assigned14336–15359: 8 assigned15360–16383: 21 assigned16384–17407: 26 assigned17408–18431: 21 assigned18432–19455: 20 assigned19456–20479: 23 assigned20480–21503: 10 assigned21504–22527: 27 assigned22528–23551: 21 assigned23552–24575: 15 assigned24576–25599: 23 assigned25600–26623: 19 assigned26624–27647: 6 assigned27648–28671: 11 assigned28672–29695: 5 assigned29696–30719: 9 assigned30720–31743: 12 assigned31744–32767: 10 assigned32768–33791: 22 assigned33792–34815: 5 assigned34816–35839: 18 assigned35840–36863: 12 assigned36864–37887: 6 assigned37888–38911: 13 assigned38912–39935: 2 assigned39936–40959: 7 assigned40960–41983: 7 assigned41984–43007: 5 assigned43008–44031: 9 assigned44032–45055: 16 assigned45056–46079: 6 assigned46080–47103: 6 assigned47104–48127: 14 assigned48128–49151: 8 assigned49152–50175: 0 assigned50176–51199: 0 assigned51200–52223: 0 assigned52224–53247: 0 assigned53248–54271: 0 assigned54272–55295: 0 assigned55296–56319: 0 assigned56320–57343: 0 assigned57344–58367: 0 assigned58368–59391: 0 assigned59392–60415: 0 assigned60416–61439: 0 assigned61440–62463: 0 assigned62464–63487: 0 assigned63488–64511: 0 assigned64512–65535: 0 assigned04915265535Black bar: 0–1023, 686 assignedDynamic Portsnever assigned
05001,0000–1023: 686 assigned1024–2047: 1011 assigned2048–3071: 1015 assigned3072–4095: 1006 assigned4096–5119: 532 assigned5120–6143: 391 assigned6144–7167: 249 assigned7168–8191: 253 assigned8192–9215: 207 assigned9216–10239: 164 assigned10240–11263: 50 assigned11264–12287: 38 assigned12288–13311: 14 assigned13312–14335: 32 assigned14336–15359: 8 assigned15360–16383: 21 assigned16384–17407: 26 assigned17408–18431: 21 assigned18432–19455: 20 assigned19456–20479: 23 assigned20480–21503: 10 assigned21504–22527: 27 assigned22528–23551: 21 assigned23552–24575: 15 assigned24576–25599: 23 assigned25600–26623: 19 assigned26624–27647: 6 assigned27648–28671: 11 assigned28672–29695: 5 assigned29696–30719: 9 assigned30720–31743: 12 assigned31744–32767: 10 assigned32768–33791: 22 assigned33792–34815: 5 assigned34816–35839: 18 assigned35840–36863: 12 assigned36864–37887: 6 assigned37888–38911: 13 assigned38912–39935: 2 assigned39936–40959: 7 assigned40960–41983: 7 assigned41984–43007: 5 assigned43008–44031: 9 assigned44032–45055: 16 assigned45056–46079: 6 assigned46080–47103: 6 assigned47104–48127: 14 assigned48128–49151: 8 assigned49152–50175: 0 assigned50176–51199: 0 assigned51200–52223: 0 assigned52224–53247: 0 assigned53248–54271: 0 assigned54272–55295: 0 assigned55296–56319: 0 assigned56320–57343: 0 assigned57344–58367: 0 assigned58368–59391: 0 assigned59392–60415: 0 assigned60416–61439: 0 assigned61440–62463: 0 assigned62464–63487: 0 assigned63488–64511: 0 assigned64512–65535: 0 assigned04915265535Black bar: 0–1023, 686 assigned49152 and up:never assigned

Port ranges

Numbers with an assignment in each range page. Above 12000, ranges are merged until each holds at least 20.

Ports with their own page

The 27 pages for numbers whose registry entries stand apart from their neighbors. Every other number is a row on its range page.

Handbook

Patterns Ports that cite an RFC · Plain and TLS port pairs · Different services on TCP and UDP · SCTP and DCCP port numbers · Renamed service names · Numbers shared by several services