elasticsearch/docs/reference/query-languages/esql/_snippets/functions/examples/to_ip.md

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Example

ROW str1 = "1.1.1.1", str2 = "foo"
| EVAL ip1 = TO_IP(str1), ip2 = TO_IP(str2)
| WHERE CIDR_MATCH(ip1, "1.0.0.0/8")

str1:keyword	str2:keyword	ip1:ip	ip2:ip
1.1.1.1	foo	1.1.1.1	null

Note that in this example, the last conversion of the string isn’t possible. When this happens, the result is a null value. In this case a Warning header is added to the response. The header will provide information on the source of the failure:

"Line 1:68: evaluation of [TO_IP(str2)] failed, treating result as null. Only first 20 failures recorded."

A following header will contain the failure reason and the offending value:

"java.lang.IllegalArgumentException: 'foo' is not an IP string literal."