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 208.56.21.0 against Spamhaus ZEN. Not listed (NotExistentDomain). 46ms
094
+046
Checking 208.56.21.0 against Barracuda Central. Not listed (NotExistentDomain). 46ms
155
+061
Checking 208.56.21.0 against spamcop. Not listed (NotExistentDomain). 60ms
732
+576
Checking 208.56.21.0 against Spamrats!. Error: ServerFailure. 576ms
901
+169
Checking 208.56.21.0 against SURBL (multi). Not listed (NotExistentDomain). 169ms
949
+048
Checking 208.56.21.0 against PSBL (Passive Spam Block List). Not listed (NotExistentDomain). 47ms
1.019
+070
Checking 208.56.21.0 against UCEPROTECT lvl 2. Not listed (NotExistentDomain). 69ms
1.206
+188
Checking 208.56.21.0 against GBUdb. Not listed (NotExistentDomain). 187ms
1.929
+000
Checking 208.56.21.0 against ips.backscatterer.org. Not listed (NotExistentDomain). 81ms
2.245
+1.039
Checking 208.56.21.0 against SORBS. Not listed (NotExistentDomain). 1.038ms
2.298
+053
Checking 208.56.21.0 against Junk Email Filter (tm). Not listed (NotExistentDomain). 52ms
2.298
+000
Done
2.298
+000
11 DNSBL's checked in 2.296ms.
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