按端口號(hào)可分為3大類：
（1）公認(rèn)端口（Well Known
Ports）：從0到1023，它們緊密綁定（binding）于一些服務(wù)。通常這些端口的通訊明確表明了某種服務(wù)的協(xié)議。例如：80端口實(shí)際上總是HTTP通訊。
（2）注冊(cè)端口（Registered
Ports）：從1024到49151。它們松散地綁定于一些服務(wù)。也就是說有許多服務(wù)綁定于這些端口，這些端口同樣用于許多其它目的。例如：許多系統(tǒng)處理動(dòng)態(tài)端口從1024左右開始。
（3）動(dòng)態(tài)和/或私有端口（Dynamic and/or Private
Ports）：從49152到65535。理論上，不應(yīng)為服務(wù)分配這些端口。實(shí)際上，機(jī)器通常從1024起分配動(dòng)態(tài)端口。但也有例外：SUN的RPC端口從32768開始。
0
通常用于分析操作系統(tǒng)。這一方法能夠工作是因?yàn)樵谝恍┫到y(tǒng)中“0”是無效端口，當(dāng)你試圖使用一種通常的閉合端口連接它時(shí)將產(chǎn)生不同的結(jié)果。一種典型的掃描：使用IP地址為0.0.0.0，設(shè)置ACK位并在以太網(wǎng)層廣播。
1 tcpmux TCP Port Service Multiplexer 傳輸控制協(xié)議端口服務(wù)多路開關(guān)選擇器
2 compressnet Management Utility compressnet 管理實(shí)用程序
3 compressnet Compression Process 壓縮進(jìn)程
5 rje Remote Job Entry 遠(yuǎn)程作業(yè)登錄
7 echo Echo 回顯
9 discard Discard 丟棄
11 systat Active Users 在線用戶
13 daytime Daytime 時(shí)間
17 qotd Quote of the Day 每日引用
18 msp Message Send Protocol 消息發(fā)送協(xié)議
19 chargen Character Generator 字符發(fā)生器
20 ftp-data File Transfer[Default Data] 文件傳輸協(xié)議(默認(rèn)數(shù)據(jù)口)
21 ftp File Transfer[Control] 文件傳輸協(xié)議(控制)
22 ssh SSH Remote Login Protocol SSH遠(yuǎn)程登錄協(xié)議
23 telnet Telnet 終端仿真協(xié)議
24 any private mail system 預(yù)留給個(gè)人用郵件系統(tǒng)
25 smtp Simple Mail Transfer 簡(jiǎn)單郵件發(fā)送協(xié)議
27 nsw-fe NSW User System FE NSW 用戶系統(tǒng)現(xiàn)場(chǎng)工程師
29 msg-icp MSG ICP MSG ICP
31 msg-auth MSG Authentication MSG驗(yàn)證
33 dsp Display Support Protocol 顯示支持協(xié)議
35 any private printer server 預(yù)留給個(gè)人打印機(jī)服務(wù)
37 time Time 時(shí)間
38 rap Route Access Protocol 路由訪問協(xié)議
39 rlp Resource Location Protocol 資源定位協(xié)議
41 graphics Graphics 圖形
42 nameserver WINS Host Name Server WINS 主機(jī)名服務(wù)
43 nicname Who Is “綽號(hào)” who is服務(wù)
44 mpm-flags MPM FLAGS Protocol MPM(消息處理模塊)標(biāo)志協(xié)議
45 mpm Message Processing Module [recv] 消息處理模塊
46 mpm-snd MPM [default send] 消息處理模塊(默認(rèn)發(fā)送口)
47 ni-ftp NI FTP NI FTP
48 auditd Digital Audit Daemon 數(shù)碼音頻后臺(tái)服務(wù)
49 tacacs Login Host Protocol (TACACS) TACACS登錄主機(jī)協(xié)議
50 re-mail-ck Remote Mail Checking Protocol 遠(yuǎn)程郵件檢查協(xié)議[未結(jié)束]
51 la-maint IMP Logical Address Maintenance IMP(接口信息處理機(jī))邏輯地址維護(hù)
52 xns-time XNS Time Protocol 施樂網(wǎng)絡(luò)服務(wù)系統(tǒng)時(shí)間協(xié)議
53 domain Domain Name Server 域名服務(wù)器
54 xns-ch XNS Clearinghouse 施樂網(wǎng)絡(luò)服務(wù)系統(tǒng)票據(jù)交換
55 isi-gl ISI Graphics Language ISI圖形語(yǔ)言
56 xns-auth XNS Authentication 施樂網(wǎng)絡(luò)服務(wù)系統(tǒng)驗(yàn)證
57 any private terminal access 預(yù)留個(gè)人用終端訪問
58 xns-mail XNS Mail 施樂網(wǎng)絡(luò)服務(wù)系統(tǒng)郵件
59 any private file service 預(yù)留個(gè)人文件服務(wù)
60 Unassigned 未定義
61 ni-mail NI MAIL NI郵件
62 acas ACA Services 異步通訊適配器服務(wù)
63 whois+ whois+ WHOIS+
64 covia Communications Integrator (CI) 通訊接口
65 tacacs-ds TACACS-Database Service TACACS數(shù)據(jù)庫(kù)服務(wù)
66 sql*net Oracle SQL*NET Oracle SQL*NET
67 bootps Bootstrap Protocol Server 引導(dǎo)程序協(xié)議服務(wù)端
68 bootpc Bootstrap Protocol Client 引導(dǎo)程序協(xié)議客戶端
69 tftp Trivial File Transfer 小型文件傳輸協(xié)議
70 gopher Gopher 信息檢索協(xié)議
71 netrjs-1 Remote Job Service 遠(yuǎn)程作業(yè)服務(wù)
72 netrjs-2 Remote Job Service 遠(yuǎn)程作業(yè)服務(wù)
73 netrjs-3 Remote Job Service 遠(yuǎn)程作業(yè)服務(wù)
74 netrjs-4 Remote Job Service 遠(yuǎn)程作業(yè)服務(wù)
75 any private dial out service 預(yù)留給個(gè)人撥出服務(wù)
76 deos Distributed External Object Store 分布式外部對(duì)象存儲(chǔ)
77 any private RJE service 預(yù)留給個(gè)人遠(yuǎn)程作業(yè)輸入服務(wù)
78 vettcp vettcp 修正TCP
79 finger Finger 查詢遠(yuǎn)程主機(jī)在線用戶等信息
80 http World Wide Web HTTP 全球信息網(wǎng)超文本傳輸協(xié)議
81 hosts2-ns HOSTS2 Name Server HOST2名稱服務(wù)
82 xfer XFER Utility 傳輸實(shí)用程序
83 mit-ml-dev MIT ML Device 模塊化智能終端ML設(shè)備
84 ctf Common Trace Facility 公用追蹤設(shè)備
85 mit-ml-dev MIT ML Device 模塊化智能終端ML設(shè)備
86 mfcobol Micro Focus Cobol Micro Focus Cobol編程語(yǔ)言
87 any private terminal link 預(yù)留給個(gè)人終端連接
88 kerberos Kerberos Kerberros安全認(rèn)證系統(tǒng)
89 su-mit-tg SU/MIT Telnet Gateway SU/MIT終端仿真網(wǎng)關(guān)
90 dnsix DNSIX Securit Attribute Token Map DNSIX
安全屬性標(biāo)記圖
91 mit-dov MIT Dover Spooler MIT Dover假脫機(jī)
92 npp Network Printing Protocol 網(wǎng)絡(luò)打印協(xié)議
93 dcp Device Control Protocol 設(shè)備控制協(xié)議
94 objcall Tivoli Object Dispatcher Tivoli對(duì)象調(diào)度
95 supdup SUPDUP
96 dixie DIXIE Protocol Specification DIXIE協(xié)議規(guī)范
97 swift-rvf（Swift Remote Virtural File Protocol）快速遠(yuǎn)程虛擬文件協(xié)議
98 tacnews TAC News TAC新聞協(xié)議
99 metagram Metagram Relay
100 newacct [unauthorized use]
101=NIC Host Name Server
102=ISO-TSAP
103=Genesis Point-to-Point Trans Net
104=ACR-NEMA Digital Imag. & Comm. 300
105=Mailbox Name Nameserver
106=3COM-TSMUX3com-tsmux
107=Remote Telnet Service
108=SNA Gateway Access Server
109=Post Office Protocol – Version 2
110=Post Office Protocol – Version 3
111=SUN RPC
112=McIDAS Data Transmission Protocol
113=Authentication Service
114=Audio News Multicast
115=Simple File Transfer Protocol
116=ANSA REX Notify
117=UUCP Path Service
118=SQL Servicessqlserv
119=Network News Transfer Protocol
120=CFDPTKTcfdptkt
121=Encore Expedited Remote Pro.Call
122=SMAKYNETsmakynet
123=Network Time Protocol
124=ANSA REX Trader
125=Locus PC-Interface Net Map Ser
126=Unisys Unitary Login
127=Locus PC-Interface Conn Server
128=GSS X License Verification
129=Password Generator Protocol
130=cisco FNATIVE
131=cisco TNATIVE
132=cisco SYSMAINT
133=Statistics Service
134=INGRES-NET Service
135=Location Service
136=PROFILE Naming System
137=NETBIOS Name Service
138=NETBIOS Datagram Service
139=NETBIOS Session Service
140=EMFIS Data Service
141=EMFIS Control Service
142=Britton-Lee IDM
143=Interim Mail Access Protocol v2
144=NewSnews
145=UAAC Protocoluaac
146=ISO-IP0iso-tp0
147=ISO-IPiso-ip
148=CRONUS-SUPPORT
149=AED 512 Emulation Service
150=SQL-NETsql-net
151=HEMShems
152=Background File Transfer Program
153=SGMPsgmp
154=NETSCnetsc-prod
155=NETSCnetsc-dev
156=SQL Service
157=KNET/VM Command/Message Protocol
158=PCMail Serverpcmail-srv
159=NSS-Routingnss-routing
160=SGMP-TRAPSsgmp-traps
161=SNMP
162=SNMP TRAP
163=CMIP/TCP Manager
164=CMIP/TCP Agent
165=Xeroxxns-courier
166=Sirius Systems
167=NAMPnamp
168=RSVDrsvd
169=Send
170=Network PostScript
170=Network PostScript
171=Network Innovations Multiplex
172=Network Innovations CL/1
173=Xyplexxyplex-mux
174=MAILQ
175=VMNET
176=GENRAD-MUXgenrad-mux
177=X Display Manager Control Protocol
178=NextStep Window Server
179=Border Gateway Protocol
180=Intergraphris
181=Unifyunify
182=Unisys Audit SITP
183=OCBinderocbinder
184=OCServerocserver
185=Remote-KIS
186=KIS Protocolkis
187=Application Communication Interface
188=Plus Five s MUMPS
189=Queued File Transport
189=Queued File Transport
190=Gateway Access Control Protocol
190=Gateway Access Control Protocol
191=Prospero Directory Service
191=Prospero Directory Service
192=OSU Network Monitoring System
193=srmp, Spider Remote Monitoring Protocol
194=irc, Internet Relay Chat Protocl
195=DNSIX Network Level Module Audit
196=DNSIX Session Mgt Module Audit Redir
197=Directory Location Service
198=Directory Location Service Monitor
199=SMUX
200=IBM System Resource Controller
201=at-rtmp AppleTalk Routing Maintenance
202=at-nbp AppleTalk Name Binding
203=at-3 AppleTalk Unused
204=AppleTalk Echo
205=AppleTalk Unused
206=AppleTalk Zone Information
207=AppleTalk Unused
208=AppleTalk Unused
209=Trivial Authenticated Mail Protocol
210=ANSI Z39.50z39.50
211=Texas Instruments 914C/G Terminal
212=ATEXSSTRanet
213=IPX
214=VM PWSCSvmpwscs
215=Insignia Solutions
216=Access Technology License Server
217=dBASE Unix
218=Netix Message Posting Protocol
219=Unisys ARPsuarps
220=Interactive Mail Access Protocol v3
221=Berkeley rlogind with SPX auth
222=Berkeley rshd with SPX auth
223=Certificate Distribution Center
224=Reserved (224-241)
241=Reserved (224-241)
242=Unassigned#
243=Survey Measurement
244=Unassigned#
245=LINKlink
246=Display Systems Protocol
247-255 Reserved
256-343 Unassigned
