Search Daniel Ballinger's list of ID prefixes for the first three characters of your object. (If that's an actual SFID, it's not there.)
Try going to https://[instance].salesforce.com/0EM/e , again assuming real SFID above - that should open a new record of that object for editing, assuming you have create permissions.
Run the following code as an anonymous block in Workbench or Dev Console. It works, but may not be the best method. (I welcome comments from more knowledgeable SF SE peeps.)
Id objID = '0EM30000000UE2I'; Schema.SObjectType obj = objID.getSObjectType(); Schema.DescribeSObjectResult dr = obj.getDescribe(); System.Debug(dr.getName());
(Thanks to Andrew Fawcett for his answer on 421 )