UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934
                                (Amendment No. )*

                                   TUCOWS INC.
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                                (Name of Issuer)

                           Common Stock, No Par Value
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                         (Title of Class of Securities)

                                    898697107
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                                 (CUSIP Number)

                                 Robert S. Hart
                              Mark Cuban Companies
                              5424 Deloache Avenue
                                Dallas, TX 75220
                                 (214) 378-5301

                                 With a Copy to:
                                Robert W. Dockery
                            Jenkens & Gilchrist, P.C.
                          1445 Ross Avenue, Suite 3200
                              Dallas, Texas  75202
                           Telephone:  (214) 855-4500
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       (Name, Address and Telephone Number of Person Authorized to Receive
                           Notices and Communications)

                                 AUGUST 11, 2005
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             (Date of Event which Requires Filing of this Statement)

     If the filing  person has  previously  filed a statement on Schedule 13G to
report the  acquisition  that is the subject of this Schedule 13D, and is filing
this schedule  because of Sections  240.13d-1(e),  240.13d-1(f) or 240.13d-1(g),
check the following box. |_|

     Note:  Schedules  filed in paper format shall include a signed original and
five copies of the schedule,  including all exhibits.  See Section 240.13d-7 for
other parties to whom copies are to be sent.

     *The  remainder  of this cover  page  shall be filled  out for a  reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

     The  information  required on the remainder of this cover page shall not be
deemed to be "filed"  for the purpose of Section 18 of the  Securities  Exchange
Act of 1934 (the "Act"), or otherwise subject to the liabilities of that section
of the Act but shall be subject to all other provisions of the Act (however, see
the Notes).


CUSIP No.  898697107                                                Page 2 of 6

1         NAMES OF REPORTING PERSONS.
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

          Mark Cuban

2         CHECK THE APPROPRIATE  BOX IF A MEMBER OF A GROUP (See Instructions)

           (a) [_]
           (b) [ ]

3         SEC USE ONLY

4         SOURCE OF FUNDS (See Instructions)

          PF   

5         CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEM 2(d) or 2(e)  [_]

6         CITIZENSHIP OR PLACE OF ORGANIZATION

          U.S.A.

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NUMBER                7.  SOLE VOTING POWER
OF                        6,111,700
SHARES      
BENEFICIALLY          8.  SHARED VOTING POWER
OWNED                     0                   
BY   
EACH                  9.  SOLE DISPOSITIVE POWER
REPORTING                 6,111,700
PERSON     
WITH                 10.  SHARED DISPOSITIVE POWER                  
                          0
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11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          6,111,700

12        CHECK IF THE AGGREGATE  AMOUNT IN ROW (11) EXCLUDES  CERTAIN SHARES
          (See Instructions)  [_]

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 

          8.9% (1)

14        TYPE OF REPORTING PERSON (See Instructions)

          IN 
_______________ 
(1)  Based on 68,493,838  shares  outstanding as of August 11, 2005, as reported
     in the Registration Statement on Form S-1/A of TUCOWS, INC. filed on August
     11, 2005.


CUSIP No. 898697107                                                 Page 3 of 6

                                  SCHEDULE 13D
                                       FOR
                                   Mark Cuban


Item 1.  Security and Issuer

This Schedule 13D relates to the common stock, no par value ("Common  Stock") of
TUCOWS, INC., 96 Mowat Avenue, Toronto, Ontario M6K 3M1 (the "Issuer").

Item 2.  Identity and Background

(A)  Mark Cuban

(B)  5424 Deloache Avenue
     Dallas, TX  75220

(C)  Mr.  Cuban is a  private  business  owner  and  investor.  

(D)  During the last five years,  Mr. Cuban has not been convicted in a criminal
     proceeding (excluding traffic violations or similar misdemeanors).

(E)  During  the last  five  years,  Mr.  Cuban  has not been a party to a civil
     proceeding of a judicial or administrative  body of competent  jurisdiction
     that  resulted in him being  subject to a  judgment,  decree or final order
     enjoining  future  violations of, or  prohibiting  or mandating  activities
     subject to, federal or state  securities laws or finding any violation with
     respect to such laws.

(F)  Mr.  Cuban is a citizen  of the  U.S.A.  

Item 3.  Source and Amount of Funds and Other Consideration

Through a personal investment account, the shares of Common Stock were purchased
for an aggregate purchase price of $5,869,967 using personal funds of Mr. Cuban.

Item 4.  Purpose of Transaction

Mr. Cuban acquired the shares of Common Stock for investment purposes. Mr. Cuban
intends to assess his investment in the Issuer from time to time on the basis of
various factors, including, without limitation, the Issuer's business, financial
condition,  results of operations and prospects,  general  economic,  market and
industry  conditions,  as  well  as  other  developments  and  other  investment
opportunities.  Depending upon the foregoing factors or any other factors deemed
relevant by Mr. Cuban,  he may acquire  additional  shares of Common  Stock,  or
dispose  of all  or  part  of  the  shares  of  Common  Stock,  in  open  market
transactions,   privately  negotiated  transactions  or  otherwise.   Mr.  Cuban
currently  intends to acquire  additional  shares of Common Stock in open market


CUSIP No. 898697107                                                 Page 4 of 6


transactions  or  otherwise,  subject  to  acceptable  pricing  and  terms.  Any
acquisition  or  disposition  may be effected by Mr.  Cuban at any time  without
prior notice. Mr. Cuban may engage in communications  from time to time with one
or more stockholders, officers or directors of the Issuer regarding the Issuer's
operating  performance,  strategic direction or other matters that, if effected,
could result in or relate to, among other  things,  any of the matters set forth
in subparagraphs  (a) through (j) of Item 4 of Schedule 13D. Except as described
herein,  Mr.  Cuban does not have any  present  plans or  intentions  that would
result in, or relate  to,  any of the  matters  set forth in  subparagraphs  (a)
through (j) of Item 4 of Schedule 13D.

Item 5.  Interest in Securities of the Issuer

(A)  According to the  Registration  Statement on Form S-1/A filed by the Issuer
     on August 11,  2005,  the number of shares of Common Stock  outstanding  on
     August  11,  2005,  was  68,493,838.  As of the date of the  filing of this
     Schedule  13D, Mr.  Cuban is the  beneficial  owner of 6,111,700  shares of
     Common Stock,  which represents  approximately 8.9% of the shares of Common
     Stock outstanding.

(B)  Mr.  Cuban has the sole  power to vote or to  direct  the vote and the sole
     power to dispose or to direct the disposition of 6,111,700 shares of Common
     Stock.

(C)  The following  table  discloses the  transactions in shares of Common Stock
     during the past 60 days by Mr. Cuban:

                                           Number of     Price Per
     Date        Type of Transaction        Shares         Share
--------------- ----------------------- ---------------- -----------

   06/21/05          open market           131,500         0.94

   06/28/05          open market           100,000         1.00

   06/29/05          open market           100,000         1.00

   06/30/05          open market            10,000         1.00

   07/01/05          open market            11,400         1.00

   07/05/05          open market           200,000         1.01
 
   07/06/05          open market           500,000         1.02

   07/07/05          open market           235,000         1.01

   07/11/05          open market            80,000         1.04



CUSIP No. 898697107                                                 Page 5 of 6


                                           Number of     Price Per
     Date        Type of Transaction        Shares         Share
--------------- ----------------------- ---------------- -----------

   07/11/05          open market            250,000        1.04

   07/11/05          open market             50,000        1.03

   07/12/05          open market             14,600        1.03

   07/14/05          open market            250,000        1.01

   07/15/05          open market            325,000        1.01

   08/11/05     secondary transaction     2,500,000        0.90

   08/16/05          open market             90,600        0.92

   08/17/05          open market            185,000        0.92

   08/19/05          open market             36,100        0.87


(D)     Not applicable.

(E)     Not applicable.


Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to
        Securities of the Issuer

        Not Applicable.

Item 7. Material to Be Filed as Exhibits

        Not Applicable.



CUSIP No. 898697107                                                 Page 6 of 6


                                    SIGNATURE

     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.


Date:    August 22, 2005              /s/ MARK CUBAN                            
                                      ----------------------------------------
                                      Mark Cuban