在網絡技術中，端口（Port）大致有兩種意思：
一是物理意義上的端口，比如，ADSL Modem、集線器、交換機、路由器用於連接其他網絡設備的接口，如RJ-45端口、SC端口等等。
二是邏輯意義上的端口，一般是指TCP/IP協議中的端口，端口號的範圍從0到65535，比如用於瀏覽網頁服務的80端口，用於FTP服務的21端口等等。
分類情況：
（1）公認端口（WellKnownPorts）
從0到1023，它們緊密綁定（binding）於一些服務。通常這些端口的通訊明確表明了某種服務的協議。例如：80端口實際上總是HTTP通訊。
（2）註冊端口（RegisteredPorts）
從1024到49151。它們鬆散地綁定於一些服務。也就是說有許多服務綁定於這些端口，這些端口同樣用於許多其它目的。例如：許多系統處理動態端口從1024左右開始。
（3）動態和/或私有端口（Dynamicand/orPrivatePorts）
從49152到65535。理論上，不應爲服務分配這些端口。實際上，機器通常從1024起分配動態端口。但也有例外：SUN的RPC端口從32768開始。
TCP端口（靜態端口）
TCP 0= Reserved
TCP 1=TCP Port Service Multiplexer
TCP 2=Death
TCP 5=Remote Job Entry,yoyo
TCP 7=Echo
TCP 11=Skun
TCP 12=Bomber
TCP 16=Skun
TCP 17=Skun
TCP 18=消息傳輸協議，skun
TCP 19=Skun
TCP 20=FTP Data,Amanda
TCP 21=文件傳輸,Back Construction,Blade Runner,Doly Trojan,Fore,FTP trojan,Invisible FTP,Larva,WebEx,WinCrash
TCP 22=遠程登錄協議
TCP 23=遠程登錄（Telnet),Tiny Telnet Server (= TTS)
TCP 25=電子郵件(SMTP),Ajan,Antigen,Email Password Sender,Happy 99,Kuang2,ProMail trojan,Shtrilitz,Stealth,Tapiras,Terminator,WinPC,WinSpy,Haebu Coceda
TCP 27=Assasin
TCP 28=Amanda
TCP 29=MSG ICP
TCP 30=Agent 40421
TCP 31=Agent 31,Hackers Paradise,Masters Paradise,Agent 40421
TCP 37=Time,ADM worm
TCP 39=SubSARI
TCP 41=DeepThroat,Foreplay
TCP 42=Host Name Server
TCP 43=WHOIS
TCP 44=Arctic
TCP 48=DRAT
TCP 49=主機登錄協議
TCP 50=DRAT
TCP 51=IMP Logical Address Maintenance,Fuck Lamers Backdoor
TCP 52=MuSka52,Skun
TCP 53=DNS,Bonk (DOS Exploit)
TCP 54=MuSka52
TCP 58=DMSetup
TCP 59=DMSetup
TCP 63=whois++
TCP 64=Communications Integrator
TCP 65=TACACS-Database Service
TCP 66=Oracle SQL*NET,AL-Bareki
TCP 67=Bootstrap Protocol Server
TCP 68=Bootstrap Protocol Client
TCP 69=TFTP,W32.Evala.Worm,BackGate Kit,Nimda,Pasana,Storm,Storm worm,Theef,Worm.Cycle.a
TCP 70=Gopher服務，ADM worm
TCP 79=用戶查詢（Finger),Firehotcker,ADM worm
TCP 80=超文本服務器（Http),Executor,RingZero
TCP 81=Chubo,Worm.Bbeagle.q
TCP 82=Netsky-Z
TCP 88=Kerberos krb5服務
TCP 99=Hidden Port
TCP 102=消息傳輸代理
TCP 108=SNA網關訪問服務器
TCP 109=Pop2
TCP 110=電子郵件（Pop3),ProMail
TCP 113=Kazimas,Auther Idnet
TCP 115=簡單文件傳輸協議
TCP 118=SQL Services,Infector 1.4.2
TCP 119=新聞組傳輸協議（Newsgroup(Nntp)),Happy 99
TCP 121=JammerKiller,Bo jammerkillah
TCP 123=網絡時間協議(NTP),Net Controller
TCP 129=Password Generator Protocol
TCP 133=Infector 1.x
TCP 135=微軟DCE RPC end-point mapper服務
TCP 137=微軟Netbios Name服務（網上鄰居傳輸文件使用）
TCP 138=微軟Netbios Name服務（網上鄰居傳輸文件使用）
TCP 139=微軟Netbios Name服務（用於文件及打印機共享）
TCP 142=NetTaxi
TCP 143=Internet 郵件訪問協議版本 4（IMAP4)
TCP 146=FC Infector,Infector
TCP 150=NetBIOS Session Service
TCP 156=SQL服務器
TCP 161=Snmp
TCP 162=Snmp-Trap
TCP 170=A-Trojan
TCP 177=X Display管理控制協議
TCP 179=Border網關協議（BGP)
TCP 190=網關訪問控制協議（GACP)
TCP 194=Irc
TCP 197=目錄定位服務（DLS)
TCP 220=Internet 郵件訪問協議版本 3（IMAP3)
TCP 256=Nirvana
TCP 315=The Invasor
TCP 371=ClearCase版本管理軟件
TCP 389=Lightweight Directory Access Protocol (LDAP)
TCP 396=Novell Netware over IP
TCP 420=Breach
TCP 421=TCP Wrappers
TCP 443=安全服務（HTTPS）
TCP 444=Simple Network Paging Protocol(SNPP)
TCP 445=Microsoft-DS
TCP 455=Fatal Connections
TCP 456=Hackers paradise,FuseSpark
TCP 458=蘋果公司QuickTime
TCP 513=Grlogin
TCP 514=RPC Backdoor
UDP 520=Rip
TCP 531=Rasmin,Net666
TCP 544=kerberos kshell
TCP 546=DHCP Client
TCP 547=DHCP Server
TCP 548=Macintosh文件服務
TCP 555=Ini-Killer,Phase Zero,Stealth Spy
TCP 569=MSN
TCP 605=SecretService
TCP 606=Noknok8
TCP 660=DeepThroat
TCP 661=Noknok8
TCP 666=Attack FTP,Satanz Backdoor,Back Construction,Dark Connection Inside 1.2
TCP 667=Noknok7.2
TCP 668=Noknok6
TCP 669=DP trojan
TCP 692=GayOL
TCP 707=Welchia,nachi
TCP 777=AIM Spy
TCP 808=RemoteControl,WinHole
TCP 815=Everyone Darling
TCP 901=Backdoor.Devil
TCP 911=Dark Shadow
TCP 990=ssl加密
TCP 993=IMAP
TCP 999=DeepThroat
TCP 1000=Der Spaeher
TCP 1001=Silencer,WebEx,Der Spaeher
TCP 1003=BackDoor
TCP 1010=Doly
TCP 1011=Doly
TCP 1012=Doly
TCP 1015=Doly
TCP 1016=Doly
TCP 1020=Vampire
TCP 1023=Worm.Sasser.e
TCP端口（動態端口）
TCP 1024=NetSpy.698(YAI)
TCP 1025=NetSpy.698,Unused Windows Services Block
TCP 1026=Unused Windows Services Block
TCP 1027=Unused Windows Services Block
TCP 1028=Unused Windows Services Block
TCP 1029=Unused Windows Services Block
TCP 1030=Unused Windows Services Block
TCP 1033=Netspy
TCP 1035=Multidropper
TCP 1042=Bla
TCP 1045=Rasmin
TCP 1047=GateCrasher
TCP 1050=MiniCommand
TCP 1059=nimreg
TCP 1069=Backdoor.TheefServer.202
TCP 1070=Voice,Psyber Stream Server,Streaming Audio Trojan
TCP 1080=Wingate,Worm.BugBear.B,Worm.Novarg.B
TCP 1090=Xtreme,VDOLive
TCP 1092=LoveGate
TCP 1095=Rat
TCP 1097=Rat
TCP 1098=Rat
TCP 1099=Rat
TCP 1110=nfsd-keepalive
TCP 1111=Backdoor.AIMVision
TCP 1155=Network File Access
TCP 1170=Psyber Stream Server,Streaming Audio trojan,Voice
TCP 1200=NoBackO
TCP 1201=NoBackO
TCP 1207=Softwar
TCP 1212=Nirvana,Visul Killer
TCP 1234=Ultors
TCP 1243=BackDoor-G,SubSeven,SubSeven Apocalypse
TCP 1245=VooDoo Doll
TCP 1269=Mavericks Matrix
TCP 1313=Nirvana
TCP 1349=BioNet
TCP 1433=Microsoft SQL服務
TCP 1441=Remote Storm
TCP 1492=FTP99CMP(BackOriffice.FTP)
TCP 1503=NetMeeting T.120
TCP 1509=Psyber Streaming Server
TCP 1600=Shivka-Burka
TCP 1688=Key Management Service(密鑰管理服務)
TCP 1703=Exloiter 1.1
TCP 1720=NetMeeting H.233 call Setup
TCP 1723=VPN 網關（PPTP）
TCP 1731=NetMeeting音頻調用控制
TCP 1807=SpySender
TCP 1966=Fake FTP 2000
TCP 1976=Custom port
TCP 1981=Shockrave
TCP 1990=stun-p1 cisco STUN Priority 1 port
TCP 1990=stun-p1 cisco STUN Priority 1 port
TCP 1991=stun-p2 cisco STUN Priority 2 port
TCP 1992=stun-p3 cisco STUN Priority 3 port,ipsendmsg IPsendmsg
TCP 1993=snmp-tcp-port cisco SNMP TCP port
TCP 1994=stun-port cisco serial tunnel port
TCP 1995=perf-port cisco perf port
TCP 1996=tr-rsrb-port cisco Remote SRB port
TCP 1997=gdp-port cisco Gateway Discovery Protocol
TCP 1998=x25-svc-port cisco X.25 service (XOT)
TCP 1999=BackDoor,TransScout
TCP 2000=Der Spaeher,INsane Network
TCP 2002=W32. Beagle .AX @mm
TCP 2001=Transmisson scout
TCP 2002=Transmisson scout
TCP 2003=Transmisson scout
TCP 2004=Transmisson scout
TCP 2005=TTransmisson scout
TCP 2011=cypress
TCP 2015=raid-cs
TCP 2023=Ripper,Pass Ripper,Hack City Ripper Pro
TCP 2049=NFS
TCP 2115=Bugs
TCP 2121=Nirvana
TCP 2140=Deep Throat,The Invasor
TCP 2155=Nirvana
TCP 2208=RuX
TCP 2255=Illusion Mailer
TCP 2283=HVL Rat5
TCP 2300=PC Explorer
TCP 2311=Studio54
TCP 2556=Worm.Bbeagle.q
TCP 2565=Striker
TCP 2583=WinCrash
TCP 2600=Digital RootBeer
TCP 2716=Prayer Trojan
TCP 2745=Worm.BBeagle.k
TCP 2773=Backdoor,SubSeven
TCP 2774=SubSeven2.1&2.2
TCP 2801=Phineas Phucker
TCP 2989=Rat
TCP 3024=WinCrash trojan
TCP 3127=Worm.Novarg
TCP 3128=RingZero,Worm.Novarg.B
TCP 3129=Masters Paradise
TCP 3150=Deep Throat,The Invasor
TCP 3198=Worm.Novarg
TCP 3210=SchoolBus
TCP 3332=Worm.Cycle.a
TCP 3333=Prosiak
TCP 3389=超級終端（遠程桌面）
TCP 3456=Terror
TCP 3459=Eclipse 2000
TCP 3700=Portal of Doom
TCP 3791=Eclypse
TCP 3801=Eclypse
TCP 3996=Portal of Doom,RemoteAnything
TCP 4000=騰訊QQ客戶端
TCP 4060=Portal of Doom,RemoteAnything
TCP 4092=WinCrash
TCP 4242=VHM
TCP 4267=SubSeven2.1&2.2
TCP 4321=BoBo
TCP 4444=Prosiak,Swift remote
TCP 4500=W32.HLLW.Tufas
TCP 4567=File Nail
TCP 4590=ICQTrojan
TCP 4899=Remote Administrator服務器
TCP 4950=ICQTrojan
TCP 5000=WindowsXP服務器，Blazer 5,Bubbel,Back Door Setup,Sockets de Troie
TCP 5001=Back Door Setup,Sockets de Troie
TCP 5002=cd00r,Shaft
TCP 5011=One of the Last Trojans (OOTLT)
TCP 5025=WM Remote KeyLogger
TCP 5031=Firehotcker,Metropolitan,NetMetro
TCP 5032=Metropolitan
TCP 5190=ICQ Query
TCP 5321=Firehotcker
TCP 5333=Backage Trojan Box 3
TCP 5343=WCrat
TCP 5400=Blade Runner,BackConstruction1.2
TCP 5401=Blade Runner,Back Construction
TCP 5402=Blade Runner,Back Construction
TCP 5471=WinCrash
TCP 5512=Illusion Mailer
TCP 5521=Illusion Mailer
TCP 5550=Xtcp,INsane Network
TCP 5554=Worm.Sasser
TCP 5555=ServeMe
TCP 5556=BO Facil
TCP 5557=BO Facil
TCP 5569=Robo-Hack
TCP 5598=BackDoor 2.03
TCP 5631=PCAnyWhere data
TCP 5632=PCAnyWhere
TCP 5637=PC Crasher
TCP 5638=PC Crasher
TCP 5698=BackDoor
TCP 5714=Wincrash3
TCP 5741=WinCrash3
TCP 5742=WinCrash
TCP 5760=Portmap Remote Root Linux Exploit
TCP 5880=Y3K RAT
TCP 5881=Y3K RAT
TCP 5882=Y3K RAT
TCP 5888=Y3K RAT
TCP 5889=Y3K RAT
TCP 5900=WinVnc
TCP 6000=Backdoor.AB
TCP 6006=Noknok8
TCP 6129=Dameware Nt Utilities服務器
TCP 6272=SecretService
TCP 6267=廣外女生
TCP 6400=Backdoor.AB,The Thing
TCP 6500=Devil 1.03
TCP 6661=Teman
TCP 6666=TCPshell.c
TCP 6667=NT Remote Control,Wise 播放器接收端口
TCP 6668=Wise Video廣播端口
TCP 6669=Vampyre
TCP 6670=DeepThroat,iPhone
TCP 6671=Deep Throat 3.0
TCP 6711=SubSeven
TCP 6712=SubSeven1.x
TCP 6713=SubSeven
TCP 6723=Mstream
TCP 6767=NT Remote Control
TCP 6771=DeepThroat
TCP 6776=BackDoor-G,SubSeven,2000 Cracks
TCP 6777=Worm.BBeagle
TCP 6789=Doly Trojan
TCP 6838=Mstream
TCP 6883=DeltaSource
TCP 6912=Shit Heep
TCP 6939=Indoctrination
TCP 6969=GateCrasher,Priority,IRC 3
TCP 6970=RealAudio,GateCrasher
TCP 7000=Remote Grab,NetMonitor,SubSeven1.x
TCP 7001=Freak88
TCP 7201=NetMonitor
TCP 7215=BackDoor-G,SubSeven
TCP 7001=Freak88,Freak2k
TCP 7300=NetMonitor
TCP 7301=NetMonitor
TCP 7306=NetMonitor,NetSpy 1.0
TCP 7307=NetMonitor,ProcSpy
TCP 7308=NetMonitor,X Spy
TCP 7323=Sygate服務器端
TCP 7424=Host Control
TCP 7511=聰明基因
TCP 7597=Qaz
TCP 7609=Snid X2
TCP 7626=冰河
TCP 7777=The Thing
TCP 7789=Back Door Setup,ICQKiller
TCP 7983=Mstream
TCP 8000=騰訊OICQ服務器端，XDMA
TCP 8010=Wingate,Logfile
TCP 8011=WAY2.4
TCP 8080=WWW 代理，Ring Zero,Chubo,Worm.Novarg.B
TCP 8102=網絡神偷