Switch IP Address

We have lost our IT guru and a few months ago he installed 2 new HP Procurve switches  (HP1810-48G) and I have no idea what IP address he may have used.   I can access the other switches thru a web interface since I have those IP addresses.    Is there an "easy" way to find out what the IP address is on these 2 devices?
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Russ SuterSenior Software DeveloperCommented:

It's great for discovering devices on a network. You should be able to pinpoint the switch fairly easily from a quick scan of the network.
bankwestCTO/CashierAuthor Commented:
Thank you...I do see a couple IP addresses that could very well be the new switches. (definitely in the IP range for our switches)   BUT, when I try to use web interface, it just gives "page can't be displayed"
What should be my next step?
Russ SuterSenior Software DeveloperCommented:
Assuming you have found the device on the correct IP address I can think of 2 possibilities off  the top of my head.

1. The web interface is not on port 80. This is not uncommon among managed switches. Consult the user guide for more details.
2. The smart switching services have been disabled. This sometimes happens for a variety of reasons. If that's the case then the switch wouldn't even have an IP address. It just becomes an unmanaged switch. In that case a hard reset would probably be required. The procedures for a hard reset should also be found in the user guide.

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Mick FinleyNetwork EngineerCommented:
(1)An 1810 is a managed switch, it's default ip address is, you could try that if directly connected...(2)On your core, you can use CLI command 'sh cdp neighbors' which will show all switches directly connected...(3)On the back of the 1810 will be a sticker with the mac-address, use your networks ARP to correlate that MAC to IP address
bankwestCTO/CashierAuthor Commented:
Sorry, I am really trying to learn all this.     I am at a DOS window.    If I use the command above, it says "sh" is not recognized.
Mick FinleyNetwork EngineerCommented:
You have to telnet or ssh to your core switch...Do you have full access to all the switches on your network?  From the DOS prompt, if Telnet client is enabled on your pc, type 'telnet 192.168.x.x' (ip address of your core switch), if telnet isn't enabled,you will get an error
Russ SuterSenior Software DeveloperCommented:
For establishing SSH sessions on a Windows client I use Putty


If you are able to use telnet you should shut that off in favor of ssh which is more secure.
bankwestCTO/CashierAuthor Commented:
When I try telnet     telnet not recognized.
I do have Putty, but again, I could really use some help.  
My other switches I use SSH with Putty to access.
I tried Putty, using and nothing.......................
Mick FinleyNetwork EngineerCommented:
An 1810 is http only, my point with telnet/ssh was to connect to your core, it most likely contains the ip addresses you are looking for....what is your core switch?
bankwestCTO/CashierAuthor Commented:
Ok, here is where I am WEAK....      I am assuming THIS is the core switch.   (actually one of two)

These 2 switches are in our main server room and everything runs thru them.    ????????

The previous IT guy did not leave any notes on what he may have set the IP address to.
Mick FinleyNetwork EngineerCommented:
Connect to a switch which is directly connected to one of these unknown switches, all HP switches have a CDP or LLDP tabs, if one of these 1810's is directly connected, it will show up on the connected switch
Mick FinleyNetwork EngineerCommented:
Also, if these unknown switches are not static ip's and are using DHCP, look for the mac-address in your DHCP database and the ip will be there
bankwestCTO/CashierAuthor Commented:
Ok....I have a switch that I logged into and on the LLDP neighbor, it shows the default HP IP of 192.168.x.xx.        So why cant I access it via the web?  
Do I need to connect direct to the switch with a laptop?     So I can establish the connection with web interface?
Russ SuterSenior Software DeveloperCommented:
First off, a side note. It's not necessary to mask the IP address (192.168.x.xx) in this case. That is a non-routable IP address and therefore completely meaningless outside your internal network. There are no security risks in everyone on this board knowing that IP address unless they also know your public IP address.

There could be many reasons why the web interface isn't available.

1. The interface is down for some reason.
2. The interface is not available on standard port 80.
3. There is a firewall rule (somewhere) that is blocking HTTP access to the IP address of the switch.
4. (As stated above) The smart switch management feature is turned off and the device has been converted to an unmanaged switch.
5. Your Intranet is on a different subnet. Many larger organizations use a Class A non-routable IP range and this device has a default Class C non-routable IP address.

What is the IP address of the machine you're trying to connect from? Does it look like 192.168.xxx.xxx or does it look like 10.0.x.x or 172.16.xxx.xxx
bankwestCTO/CashierAuthor Commented:
Trying to connect from 10.1.x.x
bankwestCTO/CashierAuthor Commented:

This is going to help ????.     I just found some notes on the new switches.

Notes say the switch is Not configured at all.     Letting the DHCP server on the Sonicwall router set the IP.  
So...........   I have logged onto the Sonicwall and looking at the DHCP Server and listing of the MAC addresses.   Well, I don't see the MAC address for either one of the switches.    I looked at the ARP and the MAC address is not listed there either.    I even looked at the tab for Neighbor Discovery.    Not listed. there either
Mick FinleyNetwork EngineerCommented:
go to to the 1810 and physically connect a cable to one of it's ports, give your laptop an ip address of

try to connect to the default via browser
Russ SuterSenior Software DeveloperCommented:
So if you're trying to connect to 192.168.xxx.xxx from 10.0.x.x you're not going to have any luck unless you have some kind of routing table set up that allows the two subnets to talk to each other. I doubt that's the case. It seems like the managed switching was never configured on this device.

Similar to what mickfinley suggested, connect a laptop and set its IP address manually so it's in the same subnet as the switch. You should be able to connect from there. By default Class C subnets are generally configured so that only the last octet can change. That means if your switch has IP then you can only talk to it from a device that has an IP address starting with 192.168.2...

I'm oversimplifying that a little but that's the general idea.

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bankwestCTO/CashierAuthor Commented:
I will get back to this soon.   I need to try connecting laptop
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