Splunk Search

Stats to Display Counts of FQDNs and IP addresses in Same Column

kmasood
Explorer

Hello,

I have this query, which takes an ip address, returns FQDN and count columns:

base search | `ip2fqdn(ip)` | stats count by FQDN

However, there are some ip addresses that do not resolve to FQDNs, and those show up as "No Reverse Lookup". How do I get the ip addresses to appear for those entries in the above query? The result would look like:

FQDN (or IP)          Count
www.domain.tld         100
10.1.2.3               75
10.1.2.4               70
example.domain.tld     66

I've looked at coalesce and hoping to avoid doing

base search | `ip2fqdn(ip)` | stats count by FQDN,ip

Update

Using this query, I've been been able to get what I need:

base search | `ip2fqdn(ip)`
| eval myfield=FQDN." ".ip
| rex mode=sed field=myfield "s/No Reverse Lookup//g"
| eval myfield=replace(myfield,"(\w+) \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}","\1")
| stats count by myfield

Is there a more efficient way of doing this?

Tags (4)
0 Karma
1 Solution

lguinn2
Legend

This should do it - I don't know if it will be a lot faster, but it is a lot more simple.

base search 
| `ip2fqdn(ip)`
| eval myfield = if(FQDN=="No Reverse Lookup",ip,FQDN)
| stats count by myfield

View solution in original post

erwan_raulet
Explorer

Hello, is it possible to know what the search macro ip2fqdn(ip)does because I am very interesting to implement the same feature?

0 Karma

erwan_raulet
Explorer

Thanks for the link 🙂

0 Karma

kmasood
Explorer

See the external fields lookup example (http://docs.splunk.com/Documentation/Splunk/6.1.3/Knowledge/Addfieldsfromexternaldatasources#Externa... -- that ships with Splunk Enterprise

0 Karma

somesoni2
Revered Legend

Why not just this

base search | `ip2fqdn(ip)` | eval FQDN=if (FQDN="No Reverse Lookup", ip,FQDN) |stats count by FQDN

somesoni2
Revered Legend

Yeah. wish I could type faster like her 🙂

kmasood
Explorer

Thanks for dropping in, lguinn beat you by 3 mins (-:

0 Karma

lguinn2
Legend

This should do it - I don't know if it will be a lot faster, but it is a lot more simple.

base search 
| `ip2fqdn(ip)`
| eval myfield = if(FQDN=="No Reverse Lookup",ip,FQDN)
| stats count by myfield

kmasood
Explorer

Thank you, just what I was looking for.

0 Karma
Get Updates on the Splunk Community!

Introducing the Splunk Community Dashboard Challenge!

Welcome to Splunk Community Dashboard Challenge! This is your chance to showcase your skills in creating ...

Get the T-shirt to Prove You Survived Splunk University Bootcamp

As if Splunk University, in Las Vegas, in-person, with three days of bootcamps and labs weren’t enough, now ...

Wondering How to Build Resiliency in the Cloud?

IT leaders are choosing Splunk Cloud as an ideal cloud transformation platform to drive business resilience,  ...