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.
Checking 209.21.0.0 against SORBS. Not listed (NotExistentDomain). 12ms
021
+000
Checking 209.21.0.0 against SURBL (multi). Not listed (NotExistentDomain). 19ms
031
+000
Checking 209.21.0.0 against PSBL (Passive Spam Block List). Not listed (NotExistentDomain). 27ms
032
+000
Checking 209.21.0.0 against Barracuda Central. Not listed (NotExistentDomain). 29ms
042
+000
Checking 209.21.0.0 against spamcop. Not listed (NotExistentDomain). 40ms
060
+000
Checking 209.21.0.0 against ips.backscatterer.org. Not listed (NotExistentDomain). 57ms
067
+067
Checking 209.21.0.0 against Spamhaus ZEN. Not listed (NotExistentDomain). 66ms
101
+000
Checking 209.21.0.0 against UCEPROTECT lvl 2. Not listed (NotExistentDomain). 99ms
103
+000
Checking 209.21.0.0 against Junk Email Filter (tm). Not listed (NotExistentDomain). 99ms
165
+000
Checking 209.21.0.0 against GBUdb. Not listed (NotExistentDomain). 162ms
289
+000
Checking 209.21.0.0 against Spamrats!. Error: ServerFailure. 285ms
289
+221
Done
289
+000
11 DNSBL's checked in 287ms.
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