You may perform this lookup using the API and get the results as easy-to-parse JSON data.
Read more on the API at https://iamroot.tech/about/api (regarding authentication and rate limits, among other things), or give it a go right away using the 'try it' button.
Asking 'whois.iana.org' for info on '2801:19c:10::' - recieved a valid response of 269 bytes in 116ms.
1.008
+000
IP is managed by lacnic.net. Response from IANA WHOIS in 207ms.
1.008
+000
Starting lookup
1.008
+000
Querying 'lacnic.net' for RDAP info on '2801:19c:10::'. Response in 735ms.
1.008
+000
Done
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