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Barracuda Web Security Gateway

How do I find the IP address of a site that I would like to block or exempt?

  • Type: Knowledgebase
  • Date changed: 4 years ago
Solution #00006531

Scope:

Barracuda Web Filter - All Firmware Versions

Answer:
There are several reasons why you would need to block or exempt a site. See Solution 00004277 for information about adding exemptions. Before you can block or exempt a website IP address, you need to find out what that IP address is. There are several ways to find out this information.

1. You can use the web filter troubleshooting tools to find out this information. See Solution 00006350 for information on using the Web Filter troubleshooting tools.


2. You can ping the site at the command line and the ip address will be returned in the echo reply.
C:\ping google.com

Pinging google.com [74.125.239.110] with 32 bytes of data:

Reply from 74.125.239.110: bytes=32 time=3ms TTL=55

Reply from 74.125.239.110: bytes=32 time=3ms TTL=55

Reply from 74.125.239.110: bytes=32 time=3ms TTL=55

Reply from 74.125.239.110: bytes=32 time=3ms TTL=55


3. You can also use the nslookup tool on the windows command line.

C:\nslookup google.com

Server: abc.xyz.local

Address: 192.168.5.5

Non-authoritative answer:

Name: google.com

Addresses: 2607:f8b0:4005:800::1002

74.125.239.96

74.125.239.97

74.125.239.98

74.125.239.99

74.125.239.100

74.125.239.101

74.125.239.102

74.125.239.103

Additional notes:
 
For one third party app you can use.
If you use Chrome at all, there is an add-on extension called “IP address and domain information”
This will usually give full details of the whole site you go to.
Load site and then click the extensions ICON for details. It should be located after the URL field of your browser.
It uses tcpiputils.com to gather all details it can on the site and shows the range of IPs used etc… for a more extensive list of IPs found.
Example: opened domain.com site and see this as their range used.
IP-range/subnet
65.254.224.0/19
65.254.224.0 - 65.254.255.255
While only an nslookup showed me this IP 65.254.244.180 alone.
This is not a barracuda supported service.
Link to this page:
https://campus.barracuda.com/solution/501600000013hNqAAI