Can I search IPs with no syntax?

[kruane]

Can't I just search an IP within Splunk with no syntax, just 192.15.10.1 and if there is any data or this IP is simply being accessed by one of our users, then I should be able to see it.

Are there better ways to find it? 

Overall I want to see if two specific IPs are connecting to Splunk, if so, then broaden the search. 

[martinpu]

You can use quotation marks like so and use OR if you want to search for multiple IPs

index=yourindex  "192.15.10.1" OR "192.15.10.2" 

Or extract all ips:

index=yourindex yourkeyword
|rex max_match=0 "(?<ip>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})"
|search ip="192.15.10.1"