Document and Entity Information	3 Months Ended
	Jul. 31, 2012	Sep. 13, 2012
Document and Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2012
Trading Symbol	onci
Entity Registrant Name	ON4 COMMUNICATIONS INC.
Entity Central Index Key	0001300867
Current Fiscal Year End Date	--10-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		76,294,124
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well Known Seasoned Issuer	No
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1