Scenario:
How to get the details of Instance using particular Elastic IP (EIP) - How to get the details of Instance using particular Elastic IP (EIP).
For example:
I have an EIP with me and I don't know where its located ?
Answering to - "I don't know where its located" :
- You can use "nslookup" or "dig -x" command to check the "aws region" where EIP is located.
Example:
# dig -x 52.xxxxxxxx +short
ec2-52xxxxxxxxxxxus-west-2.compute.amazonaws.com.
C:\Users\administrator> nslookup 52.xxxxxxxxxxx
Server: recycled-xxxxxxxxxx.xxxx
Address: xx.xx.xx.xx
Name: ec2-52-xxxxxxxxxxx.us-west-2.compute.amazonaws.com
Address: 52.xxxxxxxx
This confirms the association of domain with EIP and region of the resource is
(us-west-2)
Now, Let's figure out where or to which instance it has been attached to ??
==========================================================
The only way to get the details of EIP address associated with your Instance in a particular account is to login in the existing account and check it and you have two methods to do so:
1). Using console:-
- Go to EC2 - Navigate to "Elastic IP" section on left or click here
- Then you can see the EIP details and associations with an Instance. For more details , please check :
[+] https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html
[+] https://aws.amazon.com/premiumsupport/knowledge-center/vpc-find-owner-unknown-ip-addresses/
2). Using AWS CLI:-
You can use CLI command with API's (describe-addresses & describe-instances) to get the details of an EIP and its associations. I'm providing you an example below which you can refer.
Note : Please make sure you replace the EIP & Region details according to your resources where they are located in.
I've tested this as follows:
➜ Using (describe-addresses) you can get the info : ( AWS CLI command below)
# aws ec2 describe-addresses --public-ips YourEIPAddressHere --region us-west-2 --query "Addresses[].[PublicIp,PrivateIpAddress,InstanceId,AllocationId,AssociationId]" --output table
Example:
# aws ec2 describe-addresses --public-ips 52.xxxxxxxxx --region us-west-2 --query "Addresses[].[PublicIp,PrivateIpAddress,InstanceId,AllocationId,AssociationId]" --output table
----------------------------------------------------------------------------------------------------------------------
| DescribeAddresses |
+---------------+---------------+----------------------+------------------------------+------------------------------+
| 52.xxxxxxxxxxxxx| 172.xx.xx.xx | i-0axxxxxxxxxxx| eipalloc-0fxxxxxxxxx | eipassoc-08xxxxxxxx |
+---------------+---------------+----------------------+------------------------------+------------------------------+
Also,
➜ Using (describe-instances) you can get the info : (AWS CLI command below)
# aws ec2 describe-instances --region us-west-2 --filter Name="ip-address",Values="YourEIPAddressHere" |grep 'InstanceId\| YourEIPAddressHere'
Example:
# aws ec2 describe-instances --region us-west-2 --filter Name="ip-address",Values="52.xxxxxxxxxxxxxxx" |grep 'InstanceId|52.xxxxxxxxxxxx'
"InstanceId": "i-0axxxxxxxxxxx",
"PublicDnsName": "ec2-52-xxxxxxxxxxx.us-west-2.compute.amazonaws.com",
"PublicIpAddress": "52.xxxxxxxxxxxxx",
"PublicDnsName": "ec2-52-xxxxxxxxxxx.us-west-2.compute.amazonaws.com",
"PublicIp": "52.xxxxxxxxxxxxxxxxxx"
"PublicDnsName": "ec2-52-xxxxxxxxxxx.us-west-2.compute.amazonaws.com",
"PublicIp": "52.xxxxxxxxxxxxxx"
To know more on filters , you can refer to our CLI reference guide on these APIs.
[+] describe-instances :- https://docs.aws.amazon.com/cli/latest/reference/ec2/describe-instances.html
[+] describe-addresses :- https://docs.aws.amazon.com/cli/latest/reference/ec2/describe-addresses.html
Thanks
Dinesh Rathee
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