Attached files
file | filename |
---|---|
EX-32.2 - EXHIBIT-32.2 - COGENT COMMUNICATIONS HOLDINGS, INC. | ccoi-20201231xex32d2.htm |
EX-32.1 - EXHIBIT-32.1 - COGENT COMMUNICATIONS HOLDINGS, INC. | ccoi-20201231xex32d1.htm |
EX-31.2 - EXHIBIT-31.2 - COGENT COMMUNICATIONS HOLDINGS, INC. | ccoi-20201231xex31d2.htm |
EX-31.1 - EXHIBIT-31.1 - COGENT COMMUNICATIONS HOLDINGS, INC. | ccoi-20201231xex31d1.htm |
EX-23.1 - EXHIBIT-23.1 - COGENT COMMUNICATIONS HOLDINGS, INC. | ccoi-20201231xex23d1.htm |
EX-21.1 - EXHIBIT-21.1 - COGENT COMMUNICATIONS HOLDINGS, INC. | ccoi-20201231xex21d1.htm |
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