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EXHIBIT 21.1

In Effect as of February 1, 2025

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Legal Entity

Jurisdiction

COGENT COMMUNICATIONS HOLDINGS, INC.

Delaware

subsidiaries:

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COGENT COMMUNICATIONS GROUP, LLC

Delaware

COGENT COMMUNICATIONS, LLC

Delaware

COGENT FINANCE, INC.

Delaware

COGENT COMMUNICATIONS OF CALIFORNIA, INC.

Delaware

COGENT COMMUNICATIONS OF D.C., INC.

Delaware

COGENT COMMUNICATIONS OF FLORIDA, INC.

Delaware

COGENT COMMUNICATIONS OF MARYLAND, INC.

Delaware

COGENT COMMUNICATIONS OF TEXAS USA, INC.

Delaware

COGENT IH, LLC

Delaware

COGENT WG, LLC

Delaware

COGENT TW, LLC

Delaware

COGENT RB, LLC

Delaware

COGENT AFRICAONE, LLC

Delaware

COGENT AFRICATWO, LLC

Delaware

COGENT INFRASTRUCTURE, LLC

Delaware

COGENT IPV4 HOLDCO LLC

Delaware

COGENT IPV4 LLC

Delaware

WIRELINE NETWORK HOLDINGS LLC

Delaware

UTELCOM LLC

Kansas

SPRINT INTERNATIONAL HOLDING LLC

Kansas

SPRINT COMMUNICATIONS COMPANY LP

Delaware

SPRINT INTERNATIONAL LLC

Delaware

SPRINT INTERNATIONAL COMMUNICATIONS LLC

Delaware

SPRINT INTERNATIONAL NETWORK COMPANY LLC

Delaware

SPRINT SOLUTIONS WIRELINE LLC

Delaware

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COGENT CANADA, INC.

Nova Scotia, Canada

COGENT EUROPE HOLDINGS, S.À R.L.

Luxembourg

COGENT EUROPE, SARL

Luxembourg

COGENT ALBANIA SH.P.K.

Albania

COGENT ARGENTINA S.R.L.

Argentina

COGENT COMMUNICATIONS AUSTRALIA PTY LTD

Australia

COGENT COMMUNICATIONS BELGIUM SPRL

Belgium

COGENT BRASIL TELECOMUNICAÇÕES LTDA.

Brazil

COGENT COMMUNICATIONS BULGARIA EOOD

Bulgaria

COGENT COMMUNICATIONS CHILE LIMITADA

Chile

COGENT COLOMBIA, S.A.S

Colombia

COGENT COSTA RICA LLC, S. de R.L.

Costa Rica

COGENT INTERNET d.o.o.

Croatia

COGENT COMMUNICATIONS CZECH REPUBLIC S.R.O.

Czech Republic

COGENT COMMUNICATIONS DENMARK ApS

Denmark

COGENT COMMUNICATIONS ESTONIA, OU

Estonia

COGENT COMMUNICATIONS FINLAND OY

Finland

COGENT COMMUNICATIONS France, SAS

France

CCD COGENT COMMUNICATIONS DEUTSCHLAND GmbH

Germany

(with branches in Austria and Sweden)

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AUSTRIA Permanent Establishment of C.C.D. Cogent Communications Deutschland, GmbH

Austria

SWEDISH Branch  Svensk filial till C.C.D. Communications Deutschland GmbH

Sweden

COGENT HELLAS INTERNET SERVICES SOLE MEMBER LIMITED LIABILITY COMPANY

Greece

COGENT COMMUNICATIONS GUATEMALA Y COMPAÑÍA LIMITADA

Guatemala

COGENT COMMUNICATIONS HONG KONG LIMITED

Hong Kong

COGENT COMMUNICATIONS HUNGARY KFT

Hungary

COGENT INTERNET PRIVATE LIMITED

India

CCE COGENT INTERNET SERVICES LTD.

Ireland

COGENT COMMUNICATIONS ITALIA SRL

Italy

COGENT JAPAN G.K.

Japan

COGENT COMMUNICATIONS KENYA LIMITED

Kenyan

COGENT LATVIA SIA

Latvia

COGENT LITHUANIA UAB

Lithuania

COMPANY FOR INTERNET SERVICES COGENT MACEDONIA DOOEL SKOPJE

Macedonia

Î.C.S. “COGENT INTERNET MLD” S.R.L.

Moldova

COGENT COMMUNICATIONS MONTENEGRO d.o.o., Podgorica

Montenegro

CCM COMMUNICATIONS, S.de R.L. de C.V.

Mexico

COGENT COMMUNICATIONS NETHERLANDS B.V.

Netherlands

COGENT NEW ZEALAND LIMITED

New Zealand

COGENT NORWAY AS

Norway

COGENT COMMUNICATIONS PANAMA S. de R.L.

Panama

COGENT PERÚ S.R.L.

Peru

COGENT PHILIPPINES COMMUNICATIONS, CORP.

Philippines

COGENT COMMUNICATIONS POLAND Sp.zo.o.

Poland

COGENT COMMUNICATIONS PORTUGAL Lda

Portugal

COGENT COMMUNICATIONS ROMANIA SRL

Romania

COGENT SERB D.O.O. BEOGRAD

Serbia

COGENT INTERNET SINGAPORE PTE. LTD.

Singapore

COGENT COMMUNICATIONS SLOVAKIA S.R.O.

Slovakia

COGENT ADRIA, KOMUNIKACIJE, d.o.o.

Slovenia

COGENT SOUTH AFRICA (PTY) LTD

South Africa

COGENT KOREA YUHAN HOESA (COGENT KOREA, LLC)

South Korea

COGENT COMMUNICATIONS ESPANA S.L.

Spain

COGENT INTERNET SWITZERLAND, LLC

Switzerland

COGENT TAIWAN LIMITED

Taiwan

COGENT COMMUNICATIONS TANZANIA LIMITED

Tanzania

COGENT COMMUNICATIONS (THAILAND) LIMITED

Thailand

COGENT COMMUNICATIONS INTERNET SERVICES LLC

Turkey

COGENT COMMUNICATIONS UK LTD.

United Kingdom

TOV COGENT COMMUNICATIONS UKRAINE

Ukraine

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SPRINT INTERNATIONAL ARGENTINA, S.R.L.

Argentina

SPRINT INTERNATIONAL AUSTRALIA PTY LIMITED

Australia

SPRINT INTERNATIONAL AUSTRIA GMBH

Austria

SPRINT INTERNATIONAL COLOMBIA LTDA

Colombia

SPRINT INTERNATIONAL CZECH REPUBLIC S.R.O.

Czech Republic

SPRINTLINK DENMARK APS

Denmark

SPRINTLINK GERMANY GMBH

Germany

SPRINT TELECOM INDIA PRIVATE LIMITED

India

SPRINTLINK INDIA PRIVATE LIMITED

India

SIHI MEXICO, S. DE R.L. DE C.V.

Mexico

SPRINTLINK POLAND SP. Z O.O.

Poland

SPRINT RUS LLC

Russia

SPRINT INTERNATIONAL COMMUNICATIONS SINGAPORE PTE LTD

Singapore

SPRINT INTERNATIONAL SPAIN, S.L.

Spain

SIHI SCANDINAVIA AB

Sweden

SPRINT INTERNATIONAL TAIWAN LIMITED

Taiwan

SPRINT (THAILAND) LIMITED

Thailand

SPRINTLINK UK LIMITED

United Kingdom