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can you suggest me a reliable online port scanner to check (open/closed) the ports of my DSL-router ? Thanks !

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  • Hello Mimetic, Welcome to super user! Asking for recommendations for software is offtopic on super user, you may be better off asking on softwarerecs.stackexchange.com
    – Lister
    Commented Feb 27, 2017 at 15:12
  • What is it you're trying to determine is open/closed? Are you trying to configure an open port for a service/game? Afraid of a vulnerability? Also, have you tried checking your DSL modem and/or router's configuration page, to see what it has listed as opened and closed?
    – Caturday Saint
    Commented Feb 27, 2017 at 16:06
  • Hi and sorry for being off-topic. Thanks for the other stack suggestion. @ServiceManager I have configured my DSL router but it seems quite limited and has some kind of ISP-set stuff that prevents further configuration it seems. I'm also not that savvy in networking. Therefore I wanted to at least be able to scan my connection with a third-party, online, reliable source to see if anything worrisome was open. Basically I want to have everything closed for a secure normal home use. No web server or any other SSH or Telnet feature needed.
    – MimeticPolyAlloy
    Commented Feb 27, 2017 at 19:57
  • @MimeticPolyAlloy Ok, so you want all service ports closed to increase security, but are unable to further configure the modem/router due to ISP lock down. Have you tried calling them to have them remotely configure it for this security?
    – Caturday Saint
    Commented Feb 27, 2017 at 20:07
  • @ServiceManager indeed I would like all service ports closed but still be able to browse the internet and play occasional games on steam basically. Basically for some reason it's impossible to find a comprehensive list of the ports closed or open on my router. That's why I wanted to scan from a reliable web based port scanner to make sure nothing is open.
    – MimeticPolyAlloy
    Commented Feb 27, 2017 at 22:27

1 Answer 1

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My suggestion would be to run nmap from a different location (Internet connection). A friend's computer, a rented VPS or even your smartphone over 3G would be enough. Syntax is simply nmap <ip> to scan 1000 common ports, where ip is the external ip address of your home DSL connection. On Android I would install Termux and then:

  1. apt update
  2. apt install nmap
  3. nmap <ip>

I cannot recommend a specific app for iOS for not having tested any, although I believe there are that offer the same functionality.

To answer the question more directly (online port scan tools): there is MXtoolbox which among other services offers a limited port scan, and T1shopper which has a more customizable port scan tool; both are reliable and tested.

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    Can you elaborate?
    – bertieb
    Commented Feb 27, 2017 at 19:46
  • Yes please ! Could it be run from my iPhone via 3G for example ? Do you mean another location on the home network or outside ? I guess outside but not sure. Thanks !
    – MimeticPolyAlloy
    Commented Feb 27, 2017 at 20:00
  • Actually it's not first 1000 ports, but 1000 most common ports for each protocol based on popularity values in the nmap-services file.
    – gronostaj
    Commented Feb 27, 2017 at 21:07
  • Thanks for your help guys ! However IOSmap seems like something that either has to be installed on a router (so a different "IOS") or on a jailbroken iPhone seeing how it has to be installed. ciscozine.com/nmap-for-ios-no-iosmap
    – MimeticPolyAlloy
    Commented Feb 27, 2017 at 22:13
  • @MimeticPolyAlloy, That is the Cisco IOS which runs on their routers, not the Apple iOS (note different capitalisation).
    – Darren
    Commented Feb 27, 2017 at 22:52

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