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recently I turned my Router to a wireless access point for my home network. Unfortunately, I forgot to note down the AP's IP Address and Subnet.

How do I reliably get the IP of my AP?

Thank's in advance.

EDIT: OS is Vista XP, but I have xubuntu dual booted.

Ok so the configuration is as follow: PCs => (wireless) Belkin Router (AP) -> (wired, bridged) 2Wire Gateway Modem

I want to be able to get the IP Address of the AP, ie. the Belkin Router

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What OS are you using? –  Henno Jun 5 '10 at 12:45
    
Ups sorry I forgot to specify, edited now. –  andreas Jun 5 '10 at 12:57
    
Possible duplicate: superuser.com/questions/142851/get-ip-address-of-router –  Hello71 Jun 5 '10 at 13:36
    
In my care, it's a bridged network, in the link you've given, it's a normal PC -> Modem network. So I don't think it's duplicate. –  andreas Jun 5 '10 at 13:41
    
What is the ip address of your computer? If you haven't made any drastic changes, it should default to xx.xx.xx.1 (where xx is the same as your computer's) –  Default Jun 5 '10 at 14:23

9 Answers 9

up vote 6 down vote accepted

Since it is simply functioning as a WAP device now, short of reseting the WAP and using the default, it might not be all that easy.

Try going through your ARP cache (arp -a in windows, might be similar in linux) and see if the WAP has an entry. Just try each address on your local subnet that's listed.

Other than that, the WAP should be completely transparent so unless you're already communicating with its IP, its IP probably won't show up in network traffic.

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3  
+1 for using arp -a –  ta.speot.is Jun 6 '10 at 0:18
    
Nope, the only one I can see is the gateway modem's IP –  andreas Jun 6 '10 at 3:47
    
@andreas Then if it's not 192.168.0.1, 192.168.1.1, 192.168.2.1, or *.2 for any of those, I'd just reset it back to factory settings and then reconfigure it. –  Darth Android Jun 6 '10 at 5:08
    
arp -a saved my behind just now, 3 years after the answer :) Thank you! –  Chahk Dec 30 '13 at 17:22

IPCONFIG /ALL (in a command line in Windows) will tell you under the heading Default Gateway. ifconfig under Linux will tell you, and also on Mac OS X (command line), and in the GUI: Network preferences, select wireless, advanced (right below) and TCP/IP tab, router entry.

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It tells me the IP address of the modem, but not the Access Point. Perhaps a bit of background will be useful, my configuration is: PCs => Belkin Router (AP) -> (wired) Gateway Modem if I do ipconfig /all, it will tell me the Gateway Modem's IP, but not the AP. –  andreas Jun 5 '10 at 13:01
    
The router will give the IP addresses, right, so look for the DHCP server IP. It's also listed if memory serves me. –  Henno Jun 5 '10 at 13:16
    
The DNS address is coincidentally the same as gateway address. So no, I don't think it works. –  andreas Jun 5 '10 at 13:18
    
I corrected it to DHCP –  Henno Jun 5 '10 at 13:20
    
and conveniently, it's also the same as DNS and gateway. –  andreas Jun 5 '10 at 13:23

Default IP is 192.168.2.1 for a Belkin router, but can't you do a tracert to, say google.com and then find out which one is your router? (It should usually be the first hop.)

Or you could look in your browser's history...

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The first hop is the Gateway, not the AP unfortunately :( –  andreas Jun 5 '10 at 13:42
    
+1 for tracert. @Andreas: If your network traffic passes the AP you should still be able to find out the ipaddress of it with tracert. In the tracertstats, is there any other ip-addresses that are on the same subnet as your computer's? –  Default Jun 5 '10 at 14:19
    
Nope, sadly it goes straight to the Gateway –  andreas Jun 5 '10 at 14:43
    
a WAP doesn't work at the network layer so you won't see an IP hop. –  Andy Jun 5 '10 at 16:15
    
That's an interesting point, do you have a more elaborate explanation/article on that? –  andreas Jun 7 '10 at 3:23

you should be able to see this from the 2wire web interface. I'm assuming that it is a router which is the gateway address from ipconfig. Most likely would be in the logs. If the belkin was set to dhcp it should be in the dhcp log. the other option would be to use a ping utility to ping every address in the ip range and see which ones respond. if your ip address is 192.168.1.2 say you would ping every address from 192.168.1.1 to 192.168.1.254.

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I've done that, and I still can't find the AP IP Address. –  andreas Jun 5 '10 at 18:51
    
can you plug in an ethernet cable into the belkin router and see if you can get an ip address from that router? if you do it will probably have a gateway address which would be the ip address of the belkin router. if all else fails reset the router. Usually if you hold in the reset button for about 30 seconds or so it resets the router to the factory default at which point you can reconfigure it. –  user4892 Jun 6 '10 at 3:52
    
Nope, the DHCP, DNS and Gateway again are pointing to my Gateway Modem even on ethernet. I think I will start considering reseting the router . –  andreas Jun 6 '10 at 3:56

In the command prompt you can do arp -a This will show you the MAC address and IP of everything connected to the same broadcast domain that you are. Given your setup, this should show you everything on your network. You can figure out the IP by finding out the MAC address of your AP. Usually this is printed right on the device itself somewhere.

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You can use nmap to scan IPs near you own IP.
or use ping:http://www.linuxscrew.com/2007/09/17/ping-range-of-ip-addresses-in-parallel-with-fping/
there are lots of tools doing this in linux.
you can even use aircrack-ng(but this one needs some time to work).
EDIT:
I think transparent routers(I think your router is) don't have IPs.

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1  
There's no such thing as a "transparent" router. –  MDMarra Jun 5 '10 at 17:29

Unless you get get in in from your arp cache (try doing ping 192.168.0.255 first), the only way I know to find it is port scanning. Using something like nmap to scan your network - a WAP should be listening on port 80, and possibly something like telnet as well. Try nmap 192.168.0.1/24

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I had the same problem. From my Windows 7 PC, i could do a ping on the local subnet by typing

ping 192.168.X.255 -- where X is your local subnet. This should send a broadcast to ALL ips in the subnet. Of course, the ping command will fail.

Next type arp -a This should now list ALL the ping responses received on the subnet. Note that if there are systems on the subnet which have ECHO RESPONSE turned OFF, they wont show up in the list.

One of the these IPs listed will be your AP's IP. If not sure, lookup on the MAC and find out who the vendor is... (http://www.macvendorlookup.com/)

HTH

-A's B

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Reset the router to defaults and reconfigure?

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I could do that, but I really want to know if there's a way to do get IP Address of an AP. Thank's for the suggestion though. –  andreas Jun 5 '10 at 14:43

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