网络端口及其详解按端口号可分为3大类：（1）公认端口（Well Known Ports）：从0到1023，它们紧密绑定（binding）于一些服务。

通常这些端口的通讯明确表明了某种服务的协议。

例如：80端口实际上总是HTTP通讯。

（2）注册端口（Registered Ports）：从1024到49151。

它们松散地绑定于一些服务。

也就是说有许多服务绑定于这些端口，这些端口同样用于许多其它目的。

例如：许多系统处理动态端口从1024左右开始。

（3）动态和/或私有端口（Dynamic and/or Private Ports）：从49152到65535。

理论上，不应为服务分配这些端口。

实际上，机器通常从1024起分配动态端口。

但也有例外：SUN的RPC端口从32768开始。

0 通常用于分析操作系统。

这一方法能够工作是因为在一些系统中“0”是无效端口，当你试图使用一种通常的闭合端口连接它时将产生不同的结果。

一种典型的扫描：使用IP地址为0.0.0.0，设置ACK位并在以太网层广播。

1tcpmux TCP Port Service Multiplexer传输控制协议端口服务多路开关选择器2compressnet Management Utility compressnet 管理实用程序3compressnet Compression Process压缩进程5rje Remote Job Entry远程作业登录7echo Echo回显9discard Discard丢弃11systat Active Users在线用户13daytime Daytime时间17qotd Quote of the Day每日引用18msp Message Send Protocol消息发送协议19chargen Character Generator字符发生器20ftp-data File Transfer[Default Data]文件传输协议(默认数据口)21ftp File Transfer[Control]文件传输协议(控制)22ssh SSH Remote Login Protocol SSH远程登录协议23telnet Telnet终端仿真协议24any private mail system预留给个人用邮件系统25smtp Simple Mail Transfer简单邮件发送协议27nsw-fe NSW User System FE NSW 用户系统现场工程师29msg-icp MSG ICP MSG ICP31msg-auth MSG Authentication MSG验证33dsp Display Support Protocol显示支持协议35any private printer server预留给个人打印机服务37time Time时间38rap Route Access Protocol路由访问协议39rlp Resource Location Protocol资源定位协议41graphics Graphics图形42nameserver WINS Host Name Server WINS 主机名服务43nicname Who Is"绰号" who is服务44mpm-flags MPM FLAGS Protocol MPM(消息处理模块)标志协议45mpm Message Processing Module [recv]消息处理模块46mpm-snd MPM [default send]消息处理模块(默认发送口)47ni-ftp NI FTP NI FTP48auditd Digital Audit Daemon数码音频后台服务49tacacs Login Host Protocol (TACACS)TACACS登录主机协议50re-mail-ck Remote Mail Checking Protocol远程邮件检查协议[未结束]51la-maint IMP Logical Address Maintenance IMP(接口信息处理机)逻辑地址维护52xns-time XNS Time Protocol施乐网络服务系统时间协议53domain Domain Name Server域名服务器54xns-ch XNS Clearinghouse施乐网络服务系统票据交换55isi-gl ISI Graphics Language ISI图形语言56xns-auth XNS Authentication施乐网络服务系统验证57?any private terminal access预留个人用终端访问58xns-mail XNS Mail施乐网络服务系统邮件59any private file service预留个人文件服务60Unassigned未定义61ni-mail NI MAIL NI邮件?62acas ACA Services异步通讯适配器服务63whois+ whois+WHOIS+64covia Communications Integrator (CI)通讯接口65tacacs-ds TACACS-Database Service TACACS数据库服务66sql*net Oracle SQL*NET Oracle SQL*NET67bootps Bootstrap Protocol Server引导程序协议服务端68bootpc Bootstrap Protocol Client引导程序协议客户端69tftp Trivial File Transfer小型文件传输协议70gopher Gopher信息检索协议71netrjs-1Remote Job Service远程作业服务72netrjs-2Remote Job Service远程作业服务73netrjs-3Remote Job Service远程作业服务74netrjs-4Remote Job Service远程作业服务75any private dial out service预留给个人拨出服务76 deos Distributed External Object Store 分布式外部对象存储77any private RJE service预留给个人远程作业输入服务78vettcp vettcp修正TCP?79finger Finger查询远程主机在线用户等信息80http World Wide Web HTTP全球信息网超文本传输协议81hosts2-ns HOSTS2 Name Server HOST2名称服务82xfer XFER Utility传输实用程序83mit-ml-dev MIT ML Device模块化智能终端ML设备84ctf Common Trace Facility公用追踪设备85mit-ml-dev MIT ML Device模块化智能终端ML设备86mfcobol Micro Focus Cobol Micro Focus Cobol编程语言87any private terminal link预留给个人终端连接88kerberos Kerberos Kerberros安全认证系统89su-mit-tg SU/MIT Telnet Gateway SU/MIT终端仿真网关90dnsix DNSIX Securit Attribute T oken Map DNSIX 安全属性标记图91mit-dov MIT Dover Spooler MIT Dover假脱机92npp Network Printing Protocol网络打印协议93dcp Device Control Protocol设备控制协议94objcall Tivoli Object Dispatcher Tivoli对象调度95supdup SUPDUP96dixie DIXIE Protocol Specification DIXIE协议规范97swift-rvf（Swift Remote Virtural File Protocol）快速远程虚拟文件协议98tacnews TAC News TAC新闻协议99metagram Metagram Relay100newacct[unauthorized use]101=NIC Host Name Server102=ISO-TSAP103=Genesis Point-to-Point Trans Net104=ACR-NEMA Digital Imag. & Comm. 300105=Mailbox Name Nameserver106=3COM-TSMUX3com-tsmux107=Remote Telnet Service108=SNA Gateway Access Server109=Post Office Protocol - Version 2110=Post Office Protocol - Version 3111=SUN RPC112=McIDAS Data Transmission Protocol113=Authentication Service114=Audio News Multicast115=Simple File Transfer Protocol116=ANSA REX Notify117=UUCP Path Service118=SQL Servicessqlserv119=Network News Transfer Protocol120=CFDPTKTcfdptkt121=Encore Expedited Remote Pro.Call122=SMAKYNETsmakynet123=Network Time Protocol124=ANSA REX Trader125=Locus PC-Interface Net Map Ser126=Unisys Unitary Login127=Locus PC-Interface Conn Server128=GSS X License Verification129=Password Generator Protocol130=cisco FNATIVE131=cisco TNATIVE132=cisco SYSMAINT133=Statistics Service134=INGRES-NET Service135=Location Service136=PROFILE Naming System137=NETBIOS Name Service138=NETBIOS Datagram Service139=NETBIOS Session Service140=EMFIS Data Service141=EMFIS Control Service142=Britton-Lee IDM143=Interim Mail Access Protocol v2144=NewSnews145=UAAC Protocoluaac146=ISO-IP0iso-tp0147=ISO-IPiso-ip148=CRONUS-SUPPORT149=AED 512 Emulation Service150=SQL-NETsql-net151=HEMShems152=Background File Transfer Program 153=SGMPsgmp154=NETSCnetsc-prod155=NETSCnetsc-dev156=SQL Service157=KNET/VM Command/Message Protocol 158=PCMail Serverpcmail-srv159=NSS-Routingnss-routing160=SGMP-TRAPSsgmp-traps161=SNMP162=SNMP TRAP163=CMIP/TCP Manager164=CMIP/TCP Agent165=Xeroxxns-courier166=Sirius Systems167=NAMPnamp168=RSVDrsvd169=Send170=Network PostScript170=Network PostScript171=Network Innovations Multiplex172=Network Innovations CL/1173=Xyplexxyplex-mux174=MAILQ175=VMNET176=GENRAD-MUXgenrad-mux177=X Display Manager Control Protocol 178=NextStep Window Server179=Border Gateway Protocol180=Intergraphris181=Unifyunify182=Unisys Audit SITP183=OCBinderocbinder184=OCServerocserver185=Remote-KIS186=KIS Protocolkis187=Application Communication Interface 188=Plus Five401=Uninterruptible Power Supply402=Genie Protocol403=decapdecap404=ncednced405=ncldncld406=Interactive Mail Support Protocol407=Timbuktutimbuktu408=Prospero Resource Manager Sys. Man. 409=Prospero Resource Manager Node Man. 410=DECLadebug Remote Debug Protocol411=Remote MT Protocol412=Trap Convention Port413=SMSPsmsp414=InfoSeekinfoseek415=BNetbnet416=Silverplattersilverplatter417=Onmuxonmux418=Hyper-Ghyper-g419=Arielariel1420=SMPTEsmpte421=Arielariel2422=Arielariel3423=IBM Operations Planning and Control Start 424=IBM Operations Planning and Control Track 425=ICADicad-el426=smartsdpsmartsdp427=Server Location429=OCS_AMU430=UTMPSDutmpsd431=UTMPCDutmpcd432=IASDiasd433=NNSPnnsp434=MobileIP-Agent435=MobilIP-MN436=DNA-CMLdna-cml437=comscmcomscm439=dasp, Thomas Obermair440=sgcpsgcp441=decvms-sysmgtdecvms-sysmgt442=cvc_hostdcvc_hostd443=https444=Simple Network Paging Protocol445=Microsoft-DS446=DDM-RDBddm-rdb447=DDM-RFMddm-dfm448=DDM-BYTEddm-byte449=AS Server Mapper450=TServertserver512=exec, Remote process execution513=login, remote login514=cmd, exec with auto auth.514=syslog515=Printer spooler516=Unassigned517=talk519=unixtime520=extended file name server521=Unassigned522=Unassigned523=Unassigned524=Unassigned526=newdate530=rpc courier531=chatconference532=readnewsnetnews533=for emergency broadcasts539=Apertus Technologies Load Determination 540=uucp541=uucp-rlogin542=Unassigned543=klogin544=kshell545=Unassigned546=Unassigned547=Unassigned548=Unassigned549=Unassigned550=new-who551=Unassigned552=Unassigned553=Unassigned554=Unassigned555=dsf556=remotefs557-559=rmonitor560=rmonitord561=dmonitor562=chcmd563=Unassigned564=plan 9 file service565=whoami566-569 Unassigned570=demonmeter571=udemonmeter572-599 Unassigned ipc server600=Sun IPC server607=nqs606=Cray Unified Resource Manager608=Sender-Initiated/Unsolicited File Transfer 609=npmp-trapnpmp-trap610=npmp-localnpmp-local611=npmp-guinpmp-gui634=ginadginad666=Doom Id Software704=errlog copy/server daemon709=EntrustManager729=IBM NetView DM/6000 Server/Client 730=IBM NetView DM/6000 send/tcp731=IBM NetView DM/6000 receive/tcp741=netGWnetgw742=Network based Rev. Cont. Sys.744=Flexible License Manager747=Fujitsu Device Control748=Russell Info Sci Calendar Manager749=kerberos administration751=pump752=qrh754=send758=nlogin759=con760=ns762=quotad763=cycleserv765=webster767=phonephonebook769=vid771=rtip772=cycleserv2774=acmaint_dbd775=acmaint_transd780=wpgs786=Concertconcert800=mdbs_daemon996=Central Point Software997=maitrd999=puprouter1023=Reserved1024=Reserved1025=network blackjack1030=BBN IAD1031=BBN IAD1032=BBN IAD1067=Installation Bootstrap Proto. Serv. 1068=Installation Bootstrap Proto. Cli. 1080=SOCKS1083=Anasoft License Manager1084=Anasoft License Manager1155=Network File Access1222=SNI R&D network1248=hermes1346=Alta Analytics License Manager 1347=multi media conferencing1347=multi media conferencing1348=multi media conferencing1349=Registration Network Protocol 1350=Registration Network Protocol 1351=Digital Tool Works (MIT)1352=/Lotus Notelotusnote1353=Relief Consulting1354=RightBrain Software1355=Intuitive Edge1356=CuillaMartin Company1357=Electronic PegBoard1358=CONNLCLIconnlcli1359=FTSRVftsrv1360=MIMERmimer1361=LinX1362=TimeFliestimeflies1363=Network DataMover Requester1364=Network DataMover Server1365=Network Software Associates1366=Novell NetWare Comm Service Platform 1367=DCSdcs1368=ScreenCastscreencast1369=GlobalView to Unix Shell1370=Unix Shell to GlobalView1371=Fujitsu Config Protocol1372=Fujitsu Config Protocol1373=Chromagrafxchromagrafx1374=EPI Software Systems1375=Bytexbytex1376=IBM Person to Person Software1377=Cichlid License Manager1378=Elan License Manager1379=Integrity Solutions1380=Telesis Network License Manager1381=Apple Network License Manager1382=udt_os1383=GW Hannaway Network License Manager 1384=Objective Solutions License Manager 1385=Atex Publishing License Manager1386=CheckSum License Manager1387=Computer Aided Design Software Inc LM 1388=Objective Solutions DataBase Cache 1389=Document Manager1390=Storage Controller1391=Storage Access Server1392=Print Managericlpv-pm1393=Network Log Server1394=Network Log Client1395=PC Workstation Manager software1396=DVL Active Mail1397=Audio Active Mail1398=Video Active Mail1399=Cadkey License Manager1400=Cadkey Tablet Daemon1401=Goldleaf License Manager1402=Prospero Resource Manager1403=Prospero Resource Manager1404=Infinite Graphics License Manager 1405=IBM Remote Execution Starter 1406=NetLabs License Manager1407=DBSA License Manager1408=Sophia License Manager1409=Here License Manager1410=HiQ License Manager1411=AudioFileaf1412=InnoSysinnosys1413=Innosys-ACLinnosys-acl1414=IBM MQSeriesibm-mqseries1415=DBStardbstar1416=Novell LU6.2novell-lu6.21417=Timbuktu Service 1 Port1417=Timbuktu Service 1 Port1418=Timbuktu Service 2 Port1419=Timbuktu Service 3 Port1420=Timbuktu Service 4 Port1421=Gandalf License Manager1422=Autodesk License Manager1423=Essbase Arbor Software1424=Hybrid Encryption Protocol1425=Zion Software License Manager 1426=Satellite-data Acquisition System 1 1427=mloadd monitoring tool1428=Informatik License Manager1429=Hypercom NMSnms1430=Hypercom TPDUtpdu1431=Reverse Gosip Transport1432=Blueberry Software License Manager 1433=Microsoft-SQL-Server1434=Microsoft-SQL-Monitor1435=IBM CISCibm-cics1436=Satellite-data Acquisition System 2 1437=Tabulatabula1438=Eicon Security Agent/Server1439=Eicon X25/SNA Gateway1440=Eicon Service Location Protocol 1441=Cadis License Management1442=Cadis License Management1443=Integrated Engineering Software 1444=Marcam License Management 1445=Proxima License Manager1446=Optical Research Associates License Manager 1447=Applied Parallel Research LM1448=OpenConnect License Manager1449=PEportpeport1450=Tandem Distributed Workbench Facility 1451=IBM Information Management1452=GTE Government Systems License Man 1453=Genie License Manager1454=interHDL License Manager1454=interHDL License Manager1455=ESL License Manager1456=DCAdca1457=Valisys License Manager1458=Nichols Research Corp.1459=Proshare Notebook Application1460=Proshare Notebook Application1461=IBM Wireless LAN1462=World License Manager1463=Nucleusnucleus1464=MSL License Manager1465=Pipes Platform1466=Ocean Software License Manager1467=CSDMBASEcsdmbase1468=CSDMcsdm1469=Active Analysis Limited License Manager 1470=Universal Analytics1471=csdmbasecsdmbase1472=csdmcsdm1473=OpenMathopenmath1474=Telefindertelefinder1475=Taligent License Manager1476=clvm-cfgclvm-cfg1477=ms-sna-server1478=ms-sna-base1479=dberegisterdberegister1480=PacerForumpacerforum1481=AIRSairs1482=Miteksys License Manager1483=AFS License Manager1484=Confluent License Manager1485=LANSourcelansource1486=nms_topo_serv1487=LocalInfoSrvr1488=DocStordocstor1489=dmdocbrokerdmdocbroker1490=insitu-confinsitu-conf1491=anynetgateway1492=stone-design-11493=netmap_lmnetmap_lm1494=icaica1495=cvccvc1496=liberty-lmliberty-lm1497=rfx-lmrfx-lm1498=Watcom-SQLwatcom-sql1499=Federico Heinz Consultora1500=VLSI License Manager1501=Satellite-data Acquisition System 31502=Shivashivadiscovery1503=Databeamimtc-mcs1504=EVB Software Engineering License Manager 1505=Funk Software, Inc.1524=ingres1525=oracle1525=Prospero Directory Service non-priv1526=Prospero Data Access Prot non-priv1527=oracletlisrv1529=oraclecoauthor1600=issd1651=proshare conf audio1652=proshare conf video1653=proshare conf data1654=proshare conf request1655=proshare conf notify1661=netview-aix-1netview-aix-11662=netview-aix-2netview-aix-21663=netview-aix-3netview-aix-31664=netview-aix-4netview-aix-41665=netview-aix-5netview-aix-51666=netview-aix-6netview-aix-61986=cisco license management1987=cisco RSRB Priority 1 port1988=cisco RSRB Priority 2 port1989=cisco RSRB Priority 3 port1989=MHSnet systemmshnet1990=cisco STUN Priority 1 port1991=cisco STUN Priority 2 port1992=cisco STUN Priority 3 port1992=IPsendmsgipsendmsg1993=cisco SNMP TCP port1994=cisco serial tunnel port1995=cisco perf port1996=cisco Remote SRB port1997=cisco Gateway Discovery Protocol 1998=cisco X.25 service (XOT)1999=cisco identification port2009=whosockami2010=pipe_server2011=raid2012=raid-ac2013=rad-am2015=raid-cs2016=bootserver2017=terminaldb2018=rellpack2019=about2019=xinupageserver2020=xinupageserver2021=xinuexpansion12021=down2022=xinuexpansion22023=xinuexpansion32023=xinuexpansion42024=xinuexpansion42025=xribs2026=scrabble2027=shadowserver2028=submitserver2039=device22032=blackboard2033=glogger2034=scoremgr2035=imsldoc2038=objectmanager2040=lam2041=interbase2042=isis2043=isis-bcast2044=primsl2045=cdfunc2047=dls2048=dls-monitor2065=Data Link Switch Read Port Number2067=Data Link Switch Write Port Number2201=Advanced Training System Program2500=Resource Tracking system server2501=Resource Tracking system client2564=HP 3000 NS/VT block mode telnet2784=world wide web - development3049=ccmail3264=ccmail, cc:mail/lotus3333=dec-notes3984=MAPPER network node manager3985=MAPPER TCP/IP server3986=MAPPER workstation server3421=Bull Apprise portmapper3900=Unidata UDT OS4132=NUTS Daemonnuts_dem4133=NUTS Bootp Server4343=UNICALL4444=KRB5244672=remote file access server5002=radio free ethernet5010=TelepathStarttelelpathstart5011=TelepathAttack5050=multimedia conference control tool5145=rmonitor_secure5190=aol, America-Online5300=HA cluster heartbeat5301=hacl-gs # HA cluster general services5302=HA cluster configuration5303=hacl-probe HA cluster probing5305=hacl-test6000-6063=x11 X Window System6111=sub-process HP SoftBench Sub-Process Control 6141/=meta-corp Meta Corporation License Manager 6142=aspentec-lm Aspen Technology License Manager 6143=watershed-lm Watershed License Manager6144=statsci1-lm StatSci License Manager - 16145=statsci2-lm StatSci License Manager - 26146=lonewolf-lm Lone Wolf Systems License Manager 6147=montage-lm Montage License Manager7000=afs3-fileserver file server itself7001=afs3-callback callbacks to cache managers7002=afs3-prserver users & groups database7003=afs3-vlserver volume location database7004=afs3-kaserver AFS/Kerberos authentication service7005=afs3-volser volume managment server7006=afs3-errors error interpretation service7007=afs3-bos basic overseer process7008=afs3-update server-to-server updater7009=afs3-rmtsys remote cache manager service7010=ups-online onlinet uninterruptable power supplies7100=X Font Service7200=FODMS FLIP7626=冰河8010=Wingate8181=IMail9535=man45576=E代时光专业代理端口下面解释的更具体，也算是补充。