S1 SHEFFIELD Sheffield City Centre Sheffield
S2 SHEFFIELD Arbourthorne, Heeley, Highfield, Manor, Norfolk Park, Wybourn, Park Hill Sheffield
S3 SHEFFIELD Broomhall, Burngreave, Neepsend, Netherthorpe Sheffield
S4 SHEFFIELD Grimesthorpe, Pitsmoor Sheffield
S5 SHEFFIELD Firth Park, Fir Vale, Longley, Shirecliffe, Shiregreen, Southey Green, Parson Cross Sheffield
S6 SHEFFIELD Bradfield, Dungworth, Hillsborough, Holdworth, Hollow Meadows, Loxley, Malin Bridge, Middlewood, Stannington, Storrs, Upperthorpe, Walkley, Wadsley Bridge, Wisewood, Wadsley, Fox Hill, Sheffield
S7 SHEFFIELD Abbeydale, Carter Knowle, Nether Edge, Millhouses Sheffield
S8 SHEFFIELD Batemoor, Beauchief, Greenhill, Jordanthorpe, Lowedges, Meersbrook, Norton, Norton Lees, Woodseats Sheffield
S9 SHEFFIELD Attercliffe, Brightside, Darnall, Meadowhall, Tinsley, Wincobank Sheffield
S10 SHEFFIELD Broomhill, Broomhall, Crookes, Crookesmoor, Crosspool, Fulwood, Ranmoor Sheffield
S11 SHEFFIELD Ecclesall, Endcliffe Park, Ecclesall Road, Greystones, Hunter's Bar, Millhouses, Sharrow Vale, Nether Edge, Whirlow, Brincliffe Sheffield
S12 SHEFFIELD Birley, Gleadless, Gleadless Townend, Frecheville, Hackenthorpe, Intake, Ridgeway North East Derbyshire, Sheffield
S13 SHEFFIELD Fence, Handsworth, Richmond, Woodhouse Rotherham, Sheffield
S14 SHEFFIELD Gleadless Valley Sheffield
S17 SHEFFIELD Dore, Totley, Bradway
Looking at this list of Sheffield postcodes I have punted in most of them at least once. S1, S2 (Heeley, Manor, Norfolk Park), S3 (Broomhall, Burngreave), S4 Grimesthorpe, Pitsmoor), S6 (Hillsborough, Stannington, Middlewood, Malin Bridge), S8 (Jordanthorpe, Woodseats) S9 (Attercliffe (many times!) Darnall, Tinsley) S10 (Broomhall), S11 (Sharrow Vale), S13 (Woodhouse), S14 (Gleadless Valley).
These are just the ones I can remember! Can't recall punting in S5, but I'm sure I must have done.
This leaves just about only the most upmarket area of all - S17 where I haven't indulged.
Interestingly the tower blocks I punted in Norfolk Park and Jordanthorpe are no longer there.
Nowhere did I feel unsafe at the time, but I might very well do now and I agree you can't be too careful.