SharePoint RegistrationID's

SharePoint Registration IDs reference to build Custom Actions

nvalidType = -1
GenericList = 100
DocumentLibrary = 101
Survey = 102
Links = 103
Announcements = 104
Contacts = 105
Events = 106
Tasks = 107
DiscussionBoard = 108
PictureLibrary = 109
DataSources = 110
WebTemplateCatalog = 111
UserInformation = 112
WebPartCatalog = 113
ListTemplateCatalog = 114
XMLForm = 115
MasterPageCatalog = 116
NoCodeWorkflows = 117
WorkflowProcess = 118
WebPageLibrary = 119
CustomGrid = 120
DataConnectionLibrary = 130
WorkflowHistory = 140
GanttTasks = 150
Meetings = 200
Agenda = 201
MeetingUser = 202
Decision = 204
MeetingObjective = 207
TextBox = 210
ThingsToBring = 211
HomePageLibrary = 212
Posts = 301
Comments = 302
Categories = 303
Pages = 850
IssueTracking = 1100
AdminTasks = 1200


Reference blog http://sharepointsolution2010.blogspot.com/2011/09/registration-ids-sharepoint.html

Thanks to Nandini