是否可以ping地址：端口？

#1 楼

paping -p 80 google.com

#2 楼

nmap -p 80 onofri.org

#3 楼

Minty16 ~ $ telnet localhost 139
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.

Minty16 ~ $ telnet localhost 5000
Trying 127.0.0.1...
telnet: Unable to connect to remote host: Connection refused

#4 楼

$ nc -zv localhost 22
localhost [127.0.0.1] 22 (ssh) open
$ echo $?
0
$ nc -zv localhost 23
localhost [127.0.0.1] 23 (telnet) : Connection refused
$ echo $?
1

$ date;nc -z -w 1 www.google.com 8000;date
Fri Jun 20 15:55:26 PDT 2014
Fri Jun 20 15:55:27 PDT 2014
$ date;nc -z -w 4 www.google.com 8000;date
Fri Jun 20 15:55:33 PDT 2014
Fri Jun 20 15:55:37 PDT 2014

$ nc -h
[v1.10-40]

#5 楼

$ sudo hping -S -p 80 google.com
HPING google.com (p5p1 77.237.27.37): S set, 40 headers + 0 data bytes
len=46 ip=77.237.27.37 ttl=58 id=25706 sport=80 flags=SA seq=0 win=29200 rtt=7.5 ms
len=46 ip=77.237.27.37 ttl=58 id=25707 sport=80 flags=SA seq=1 win=29200 rtt=7.4 ms
len=46 ip=77.237.27.37 ttl=58 id=25708 sport=80 flags=SA seq=2 win=29200 rtt=8.5 ms
len=46 ip=77.237.27.37 ttl=58 id=25709 sport=80 flags=SA seq=3 win=29200 rtt=7.8 ms
^C
--- google.com hping statistic ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 7.4/7.8/8.5 ms

#6 楼

$ nping -p 80 localhost

Starting Nping 0.6.00 ( http://nmap.org/nping ) at 2014-06-23 11:57 CEST
SENT (0.0015s) Starting TCP Handshake > localhost:80 (127.0.0.1:80)
RECV (0.0016s) Handshake with localhost:80 (127.0.0.1:80) completed
SENT (1.0027s) Starting TCP Handshake > localhost:80 (127.0.0.1:80)
RECV (1.0027s) Handshake with localhost:80 (127.0.0.1:80) completed
SENT (2.0038s) Starting TCP Handshake > localhost:80 (127.0.0.1:80)
RECV (2.0039s) Handshake with localhost:80 (127.0.0.1:80) completed
SENT (3.0050s) Starting TCP Handshake > localhost:80 (127.0.0.1:80)
RECV (3.0050s) Handshake with localhost:80 (127.0.0.1:80) completed
SENT (4.0061s) Starting TCP Handshake > localhost:80 (127.0.0.1:80)
RECV (4.0062s) Handshake with localhost:80 (127.0.0.1:80) completed

Max rtt: 0.032ms | Min rtt: 0.008ms | Avg rtt: 0.012ms
TCP connection attempts: 5 | Successful connections: 5 | Failed: 0 (0.00%)
Tx time: 4.00575s | Tx bytes/s: 99.86 | Tx pkts/s: 1.25
Rx time: 4.00575s | Rx bytes/s: 49.93 | Rx pkts/s: 1.25
Nping done: 1 IP address pinged in 4.01 seconds

#7 楼

$ portping() { python <<<"import socket; socket.setdefaulttimeout(1); socket.socket().connect(('', ))" 2> /dev/null && echo OPEN || echo CLOSED; }
$ portping 8.8.8.8 54
CLOSED
$ portping 8.8.8.8 53
OPEN

#8 楼

(echo >/dev/tcp/{host}/{port}) &>/dev/null && echo "opened" || echo "closed"
(echo >/dev/udp/{host}/{port}) &>/dev/null && echo "opened" || echo "closed"
(echo >/dev/tcp/www.cyberciti.biz/22) &>/dev/null && echo "Opened 22" || echo "Closed 22"
(echo >/dev/tcp/www.cyberciti.biz/443) &>/dev/null && echo "Opened 443" || echo "Closed 443"

echo >/dev/{tcp|udp}/{host}/{port}

#9 楼

#sintaxis
nmap -p [port] hostName
#first is command, after scan ports, type port - port or range ports, and ip or name of website...

## Scan port 80
nmap -p 80 onofri.org

## Scan TCP port 80
nmap -p T:80 onofri.org

## Scan UDP port 53
nmap -p U:53 onofri.org

## Scan two ports ##
nmap -p 80,443 onofri.org

## Scan port ranges ##
nmap -p 80-200 onofri.org

## Combine all options ##
nmap -p U:53,111,137,T:21-25,80,139,8080 onofri.org
nmap -p U:53,111,137,T:21-25,80,139,8080 server1.cyberciti.biz
nmap -v -sU -sT -p U:53,111,137,T:21-25,80,139,8080 onofri.org

## Scan all ports with * wildcard ##
nmap -p "*" 192.168.1.1

## Scan top ports i.e. scan $number most common ports ##
nmap --top-ports 5 onofri.org
nmap --top-ports 10 onofri.org

#10 楼

Every 2,0s: nmap -p22,80 google.com   Mon Jun 15 16:46:33 2015

Starting Nmap 6.40 ( http://nmap.org ) at 2015-06-15 16:46 NOVT
Nmap scan report for google.com (127.0.0.1)
Host is up (0.0012s latency).
rDNS record for 127.0.0.1: google.com
PORT     STATE  SERVICE
22/tcp open   ssh
80/tcp closed http

Nmap done: 1 IP address (1 host up) scanned in 0.18 seconds

#11 楼

nmap -v -p 80 onofri.org