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Migration Authorisation Code
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<p>In the <a href="/facts/United_Kingdom/kuPAILt2">United Kingdom</a> a Migration Authorisation Code (MAC) was a 17 to 19-character <a href="/facts/Unique_identifier/NMcgc7qX">unique identifier</a> code used by <a href="/facts/Digital_subscriber_line/3pY5osov">DSL</a> customers when they wish to switch <a href="/facts/Internet_service_provider/dUacAxef">internet service provider</a> (ISP). A MAC is generated by the actual telecommunication provider (most commonly <a href="/facts/BT_Group/RV9sGpcD">BT</a>), identifies the <a href="/facts/Local_loop/rSRfLPaq">local loop</a> (telephone line) to be switched, and authorises the provider to switch the customer to the new ISP. </p><p>MACs usually begin with "BBIP", "FTIP", "BBDS", or "BBDP", and consist of 4 letters, 7 digits (sometimes up to 9), a slash, 2 letters, 2 digits (this indicates the day in the month the MAC was issued), and 1 final letter. (For example: BBIP87654321/AB12C). </p>