Each machine in the Internet is assigned a unique network address， called （）， that is used to identify the machine for communication purposes. 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30328' and id < 2452098 and id<>'2452098' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30328' and id > 2452098 and id<>'2452098' order by id asc limit 5