2151 is a postalcode and its consensus geometry is derived from ausstat.
{"mz:is_ceased":0,"geom:latitude":-33.784138,"wof:name":"2151","counts:names_total":0,"wof:placetype":"postalcode","wof:hierarchy":[{"continent_id":102191583,"country_id":85632793,"county_id":102049565,"localadmin_id":404225373,"locality_id":101931457,"postalcode_id":504777679,"region_id":85681545}],"mz:is_deprecated":0,"ausstat:POA_CODE":"2151","geom:area":0.001058,"geom:longitude":151.014419,"wof:id":504777679,"ausstat:POA_NAME":"2151","counts:concordances_total":1,"geom:type":"MultiPolygon","wof:lastmodified":1480878682,"ausstat:SQKM":10.868906,"wof:belongsto":[85681545,102191583,404225373,85632793,101931457,102049565],"wof:concordances":{"gp:id":"12706806"},"wof:repo":"whosonfirst-data-postalcode-au","src:geom":"ausstat","wof:country":"AU","counts:names_preferred":0,"geom:area_square_m":1.0873309449613E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"AU","counts:names_languages":0,"geom:bbox":"150.995643872,-33.811342894,151.032150016,-33.7582270075","wof:superseded_by":[],"wof:supersedes":[],"wof:geomhash":"fb5c99672f6dfbe636fd174953688063","wof:parent_id":101931457,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu"}