External port testing

AdamF

I previously used to use this website: https://www.yougetsignal.com/tools/open-ports/ to verify open/closed ports on specific servers to the public. Do you guys use any other tool to test open/closed ports? I can do this easily with nmap of course, but I would like to preferably have a website tool to give others access to.

syko24

@fuznutz04 - https://mxtoolbox.com/NetworkTools.aspx - If you go to the tcp option. I don't think there is a udp option though.

black3dynamite

https://www.canyouseeme.org/

AdamF

@black3dynamite said in External port testing:

https://www.canyouseeme.org/

That one is almost identical to the yougetsignal one. Very simple and straight forward. Do you see any risk in using these tools?

black3dynamite

GRC ShieldsUp
https://www.grc.com/x/ne.dll?bh0bkyd2

AdamF

@black3dynamite said in External port testing:

GRC ShieldsUp
https://www.grc.com/x/ne.dll?bh0bkyd2

Forgot about that one. That's a good one. Thanks

black3dynamite

@fuznutz04 said in External port testing:

@black3dynamite said in External port testing:

https://www.canyouseeme.org/

That one is almost identical to the yougetsignal one. Very simple and straight forward. Do you see any risk in using these tools?

Any risks using online tools? Possibly, but your servers is already at risk since its accessible from the Internet anyway.

scottalanmiller

@syko24 said in External port testing:

I don't think there is a udp option though.

Can't be.

AdamF

@black3dynamite said in External port testing:

@fuznutz04 said in External port testing:

@black3dynamite said in External port testing:

https://www.canyouseeme.org/

That one is almost identical to the yougetsignal one. Very simple and straight forward. Do you see any risk in using these tools?

Any risks using online tools? Possibly, but your servers is already at risk since its accessible from the Internet anyway.

Yep. Agreed.

iroal

I like a lot this web:

portquiz.net

Test a port using a command

$ telnet portquiz.net 80
Trying ...
Connected to portquiz.net.
Escape character is '^]'.

$ nc -v portquiz.net 80
Connection to portquiz.net 80 port [tcp/daytime] succeeded!

$ curl portquiz.net:80
Port 80 test successful!
Your IP: 213.97.29.103

$ wget -qO- portquiz.net:80
Port 80 test successful!
Your IP: 213.97.29.103

For Windows PowerShell users

PS C:> Test-NetConnection -InformationLevel detailed -ComputerName portquiz.net -Port 80

dbeato

You can also use Nmap
https://nmap.org/book/man-port-scanning-basics.html
I use Angry IP Scanner for that but a lot of tools use NMAP
https://angryip.org/

scottalanmiller

nmap is so much lighter and faster than other tools, too.