Effective immediately, Rollernet will discontinue use of the dnsbl.njabl.org DNSBL zone due to its shutdown. We’re also removing it from all custom settings.
Source: http://www.njabl.org/
March 1, 2013: NJABL is in the process of being shut down. The DNSBL zones have been emptied. After “the Internet” has had some time to remove NJABL from server configs, the NS’s will be pointed off into unallocated space to hopefully make the shutdown obvious to those who were slower to notice.