来源：互联网
不同的端口有不同的作用希望大家能有所收获。端口的作用特寻问如下：
1 tcpmux TCP Port Service Multiplexer 传输控制协议端口服务多路开关选择器
2 compressnet Management Utility compressnet 管理实用程序
3 compressnet Compression Process 压缩进程
5 rje Remote Job Entry 远程作业登录
7 echo Echo 回显
9 discard Discard 丢弃
11 systat Active Users 在线用户
13 daytime Daytime 时间
17 qotd Quote of the Day 每日引用
18 msp Message Send Protocol 消息发送协议
19 chargen Character Generator 字符发生器
20 ftp-data File Transfer [Default Data] 文件传输协议(默认数据口)
21 ftp File Transfer [Control] 文件传输协议(控制)
22 ssh SSH Remote Login Protocol SSH远程登录协议
23 telnet Telnet 终端仿真协议
24 ? any private mail system 预留给个人用邮件系统
25 smtp Simple Mail Transfer 简单邮件发送协议
27 nsw-fe NSW User System FE NSW 用户系统现场工程师
29 msg-icp MSG ICP MSG ICP
31 msg-auth MSG Authentication MSG验证
33 dsp Display Support Protocol 显示支持协议
35 ? any private printer server 预留给个人打印机服务
37 time Time 时间
38 rap Route Access Protocol 路由访问协议
39 rlp Resource Location Protocol 资源定位协议
41 graphics Graphics 图形
42 nameserver WINS Host Name Server WINS 主机名服务
43 nicname Who Is "绰号" who is服务
44 mpm-flags MPM FLAGS Protocol MPM(消息处理模块)标志协议
45 mpm Message Processing Module [recv] 消息处理模块
46 mpm-snd MPM [default send] 消息处理模块(默认发送口)
47 ni-ftp NI FTP NI FTP
48 auditd Digital Audit Daemon 数码音频后台服务
49 tacacs Login Host Protocol (TACACS) TACACS登录主机协议
50 re-mail-ck Remote Mail Checking Protocol 远程邮件检查协议
51 la-maint IMP Logical Address Maintenance IMP(接口信息处理机)逻辑地址维护
52 xns-time XNS Time Protocol 施乐网络服务系统时间协议
53 domain Domain Name Server 域名服务器
54 xns-ch XNS Clearinghouse 施乐网络服务系统票据交换
55 isi-gl ISI Graphics Language ISI图形语言
56 xns-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
58 xns-mail XNS Mail 施乐网络服务系统邮件
59 ? any private file service 预留个人文件服务
60 ? Unassigned 未定义
61 ni-mail NI MAIL NI邮件?
62 acas ACA Services 异步通
63 whois+ whois+ WHOIS+
64 covia Communications Integrator (CI) 通讯接口
65 tacacs-ds TACACS-Database Service TACACS数据库服务
66 sql*net Oracle SQL*NET Oracle SQL*NET
67 bootps Bootstrap Protocol Server 引导程序协议服务端
68 bootpc Bootstrap Protocol Client 引导程序协议客户端
69 tftp Trivial File Transfer 小型文件传输协议
70 gopher Gopher 信息检索协议
71 netrjs-1 Remote Job Service 远程作业服务
72 netrjs-2 Remote Job Service 远程作业服务
73 netrjs-3 Remote Job Service 远程作业服务
74 netrjs-4 Remote Job Service 远程作业服务
75 ? any 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
77 ? any private RJE service 预留给个人远程作业输入服务
78 vettcp vettcp 修正TCP?
79 finger Finger FINGER(查询远程主机在线用户等信息)
80 http World Wide Web HTTP 全球信息网超文本传输协议
81 hosts2-ns HOSTS2 Name Server HOST2名称服务
82 xfer XFER Utility 传输实用程序
83 mit-ml-dev MIT ML Device 模块化智能终端ML设备
84 ctf Common Trace Facility 公用追踪设备
85 mit-ml-dev MIT ML Device 模块化智能终端ML设备
86 mfcobol Micro Focus Cobol Micro Focus Cobol编程语言
87 ? any private terminal link 预留给个人终端连接
88 kerberos Kerberos Kerberros安全认证系统
89 su-mit-tg SU/MIT Telnet Gateway SU/MIT终端仿真网关
90 dnsix DNSIX Securit Attribute Token Map DNSIX 安全属性标记图
91 mit-dov MIT Dover Spooler MIT Dover假脱机
92 npp Network Printing Protocol 网络打印协议
93 dcp Device Control Protocol 设备控制协议
94 objcall Tivoli Object Dispatcher Tivoli对象调度
95 supdup SUPDUP
96 dixie DIXIE Protocol Specification DIXIE协议规范
97 swift-rvf Swift Remote Virtural File Protocol 快速远程虚拟文件协议
98 tacnews TAC News TAC(东京大学自动计算机?) 新闻协议
99 metagram Metagram Relay
101/tcp hostname NIC Host Name Server
102/tcp iso-tsap ISO-TSAP Class 0
103/tcp gppitnp Genesis Point-to-Point Trans Net
104/tcp acr-nema ACR-NEMA Digital Imag. & Comm. 300
105/tcp cso CCSO name server protocol
105/tcp csnet-ns Mailbox Name Nameserver
106/tcp 3com-tsmux 3COM-TSMUX
107/tcp rtelnet Remote Telnet Service
108/tcp snagas SNA Gateway Access Server
109/tcp pop2 Post Office Protocol - Version 2
110/tcp pop3 Post Office Protocol - Version 3
111/tcp sunrpc SUN Remote Procedure Call
112/tcp mcidas McIDAS Data Transmission Protocol
113/tcp ident
114/tcp audionews Audio News Multicast
115/tcp sftp Simple File Transfer Protocol
116/tcp ansanotify ANSA REX Notify
117/tcp uucp-path UUCP Path Service
118/tcp sqlserv SQL Services
119/tcp nntp Network News Transfer Protocol
120/tcp cfdptkt CFDPTKT
121/tcp erpc Encore Expedited Remote Pro.Call
122/tcp smakynet SMAKYNET
123/tcp ntp Network Time Protocol
124/tcp ansatrader ANSA REX Trader
125/tcp locus-map Locus PC-Interface Net Map Ser
126/tcp unitary Unisys Unitary Login
127/tcp locus-con Locus PC-Interface Conn Server
128/tcp gss-xlicen GSS X License Verification
129/tcp pwdgen Password Generator Protocol
130/tcp cisco-fna cisco FNATIVE
131/tcp cisco-tna cisco TNATIVE
132/tcp cisco-sys cisco SYSMAINT
133/tcp statsrv Statistics Service
134/tcp ingres-net INGRES-NET Service
135/tcp epmap DCE endpoint resolution
136/tcp profile PROFILE Naming System
137/tcp netbios-ns NETBIOS Name Service
138/tcp netbios-dgm NETBIOS Datagram Service
139/tcp netbios-ssn NETBIOS Session Service
140/tcp emfis-data EMFIS Data Service
141/tcp emfis-cntl EMFIS Control Service
142/tcp bl-idm Britton-Lee IDM
143/tcp imap Internet Message Access Protocol
144/tcp uma Universal Management Architecture
145/tcp uaac UAAC Protocol
146/tcp iso-tp0 ISO-IP0
147/tcp iso-ip ISO-IP
148/tcp jargon Jargon
149/tcp aed-512 AED 512 Emulation Service
150/tcp sql-net SQL-NET
151/tcp hems HEMS
152/tcp bftp Background File Transfer Program
153/tcp sgmp SGMP
154/tcp netsc-prod NETSC
155/tcp netsc-dev NETSC
156/tcp sqlsrv SQL Service
157/tcp knet-cmp KNET/VM Command/Message Protocol
158/tcp pcmail-srv PCMail Server
159/tcp nss-routing NSS-Routing
160/tcp sgmp-traps SGMP-TRAPS
161/tcp snmp SNMP
162/tcp snmptrap SNMPTRAP
163/tcp cmip-man CMIP/TCP Manager
164/tcp cmip-agent CMIP/TCP Agent
165/tcp xns-courier Xerox
166/tcp s-net Sirius Systems
167/tcp namp NAMP
168/tcp rsvd RSVD
169/tcp send SEND
170/tcp print-srv Network PostScript
171/tcp multiplex Network Innovations Multiplex
172/tcp cl/1 Network Innovations CL/1
173/tcp xyplex-mux Xyplex
174/tcp mailq MAILQ
175/tcp vmnet VMNET
176/tcp genrad-mux GENRAD-MUX
177/tcp xdmcp X Display Manager Control Protocol
178/tcp nextstep NextStep Window Server
179/tcp bgp Border Gateway Protocol
180/tcp ris Intergraph
181/tcp unify Unify
182/tcp audit Unisys Audit SITP
183/tcp ocbinder OCBinder
184/tcp ocserver OCServer
185/tcp remote-kis Remote-KIS
186/tcp kis KIS Protocol
187/tcp aci Application Communication Interface
188/tcp mumps Plus Five磗 MUMPS
189/tcp qft Queued File Transport
190/tcp gacp Gateway Access Control Protocol
191/tcp prospero Prospero Directory Service
192/tcp osu-nms OSU Network Monitoring System
193/tcp srmp Spider Remote Monitoring Protocol
194/tcp irc Internet Relay Chat Protocol
195/tcp dn6-nlm-aud DNSIX Network Level Module Audit
196/tcp dn6-smm-red DNSIX Session Mgt Module Audit Redir
197/tcp dls Directory Location Service
198/tcp dls-mon Directory Location Service Monitor
199/tcp smux SMUX
200/tcp src IBM System Resource Controller
201/tcp at-rtmp AppleTalk Routing Maintenance
202/tcp at-nbp AppleTalk Name Binding
203/tcp at-3 AppleTalk Unused
204/tcp at-echo AppleTalk Echo
205/tcp at-5 AppleTalk Unused
206/tcp at-zis AppleTalk Zone Information
207/tcp at-7 AppleTalk Unused
208/tcp at-8 AppleTalk Unused
209/tcp qmtp The Quick Mail Transfer Protocol
210/tcp z39.50 ANSI Z39.50
211/tcp 914c/g Texas Instruments 914C/G Terminal
212/tcp anet ATEXSSTR
214/tcp vmpwscs VM PWSCS
215/tcp softpc Insignia Solutions
216/tcp CAIlic Computer Associates Int磍 License Server
217/tcp dbase dBASE Unix
218/tcp mpp Netix Message Posting Protocol
219/tcp uarps Unisys ARPs
220/tcp imap3 Interactive Mail Access Protocol v3
221/tcp fln-spx Berkeley rlogind with SPX auth
222/tcp rsh-spx Berkeley rshd with SPX auth
223/tcp cdc Certificate Distribution Center
242/tcp direct Direct
243/tcp sur-meas Survey Measurement
244/tcp dayna Dayna
245/tcp link LINK
246/tcp dsp3270 Display Systems Protocol
247/tcp subntbcst_tftp SUBNTBCST_TFTP
248/tcp bhfhs bhfhs
256/tcp rap RAP
257/tcp set Secure Electronic Transaction
258/tcp yak-chat Yak Winsock Personal Chat
259/tcp esro-gen Efficient Short Remote Operations
260/tcp openport Openport
263/tcp hdap HDAP
264/tcp bgmp BGMP
280/tcp http-mgmt http-mgmt
309/tcp entrusttime EntrustTime
310/tcp bhmds bhmds
312/tcp vslmp VSLMP
315/tcp dpsi DPSI
316/tcp decauth decAuth
317/tcp zannet Zannet
321/tcp pip PIP
344/tcp pdap Prospero Data Access Protocol
345/tcp pawserv Perf Analysis Workbench
346/tcp zserv Zebra server
347/tcp fatserv Fatmen Server
348/tcp csi-sgwp Cabletron Management Protocol
349/tcp mftp mftp
351/tcp matip-type-b MATIP Type B
351/tcp bhoetty bhoetty (added 5/21/97)
353/tcp ndsauth NDSAUTH
354/tcp bh611 bh611
357/tcp bhevent bhevent
362/tcp srssend SRS Send
365/tcp dtk DTK
366/tcp odmr ODMR
368/tcp qbikgdp QbikGDP
371/tcp clearcase Clearcase
372/tcp ulistproc ListProcessor
373/tcp legent-1 Legent Corporation
374/tcp legent-2
说明：
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。
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