Dynablock is a name which was used by Easynet from 2001 to 2003 for their Dialup Users List DNSBL of Internet addresses that appeared to be assigned dynamically, i.e. to dialup and residential broadband users.
Updates of Dynablock stopped December 2003 but it became the basis for NJABL and SORBS own dynamic IP lists. The dynamic list parts of NJABL and SORBS have been developed independently since then, with NJABL using the 'dynablock' name for their list. In early 2007, NJABL passed their data along to The Spamhaus Project , for using in their PBL  service.
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