Before I start talking about the problem at hand, please respect my opinions and take them into consideration, and I will return the favor. The last thing I want is an iCarly Wiki civil war, so let's all try to be nice.
So first off about the 2xx production split, I believe it was in-fact a season split. Some proof: http://danwarp.blogspot.com/2009/09/icarly-second-season-third-season-huh.html
And before you say that Dan doesn't know what he's talking about, it is obviously shown that there was a split.
Now everyone (mostly everyone, I should say), can agree that iGot A Hot Room - iParty With Victorious was part of Season 4 at least. I personally have thought of Season 4 being iGAHR - iPWV. Mainly because of iTunes iCarly Volume 5 and the September 2011 "new season" commercials. Some proof for commercials: http://www.youtube.com/watch?v=9it-xkE0yMU and proof for iTunes: https://www.facebook.com/photo.php?fbid=10150556911773308&set=a.387524058307.168829.134265793307&type=1&ref=nf
So here is how I have pictured the Seasons:
|Season||Episodes||Premiere Ep||Finale Ep||Prod Code|
|iPilot||iHave A Lovesick Teacher||1xx|
|2||25 (25-50)||iSaw Him First||iFight Shelby Marx||2xx|
|3||20 (51-70)||iThink They Kissed||iBeat The Heat|
|4||13 (71-83)||iGot A Hot Room||iParty With Victorious||3xx|
11+ (84 - )
|iLost My Mind||(The Last Episode)||4xx||5xx|
Yes, for some reason, I thought that since 4xx is/was considered the 5th Season, that the last episodes would be added to it. 11 episodes is way too short for a Season, even for Dan. Let me know what you think in the comments below.