QuickLinks -- Click here to rapidly navigate through this document

Exhibit 21.1

Subsidiaries of Cubic Corporation
Place of incorporation and percentage owned

Subsidiary	Place of incorporation	Percentage owned
ABRAXAS CORPORATION
Herndon, Virginia	Virginia		100%
ABRAXAS DAUNTLESS, INC.
Herndon, Virginia	Virginia		100%	*
*(100% owned subsidiary of Abraxas Corporation)
CTS—NORDIC AKTIEBOLAG
Malmo, Sweden	Sweden		100%	*
*(100% owned subsidiary of Cubic Transportation Systems Limited)
CUBIC APPLICATIONS, INC.
Olympia, Washington	California		100%
CUBIC COMMUNICATIONS, INC.
San Diego, California	California		100%
CUBIC CYBER SOLUTIONS, INC.
Herndon, Virginia	Delaware		100%
CUBIC DE MEXICO
Tijuana, Mexico	Mexico		100%
CUBIC DEFENSE APPLICATIONS, INC.
San Diego, California	California		100%
CUBIC DEFENCE AUSTRALIA PTY LIMITED
New South Wales, Australia	Australia		100%
CUBIC DEFENCE NEW ZEALAND
Auckland, New Zealand	New Zealand		100%	*
*(100% owned subsidiary of Cubic Holdings Ltd.)
CUBIC DEFENCE SYSTEMS LIMITED
London, United Kingdom	United Kingdom		100%	*
*(100% owned subsidiary of Cubic (UK) Limited)
CUBIC FIELD SERVICES CANADA LIMITED
Alberta, Canada	Canada		100%	*
*(100% owned subsidiary of Cubic Worldwide Technical Services, Inc.)
CUBIC GLOBAL TRACKING SOLUTIONS, INC.
Herndon, Virginia	Delaware		100%

1

Subsidiary	Place of incorporation	Percentage owned
CUBIC GLOBAL TRACKING SOLUTIONS, INC. INTERNATIONAL
Yerevan, Republic of Armenia	Republic of Armenia		100%	*
*(100% owned subsidiary of Cubic Global Tracking Solutions, Inc.)
CUBIC HOLDINGS LTD.
Auckland, New Zealand	New Zealand		100%
CUBIC LAND, INC.
San Diego, California	California		100%
CUBIC MIDDLE EAST, INC.
San Diego, California	Delaware		100%
CUBIC SECURITY SYSTEMS, INC.
San Diego, California	California		100%
CUBIC SIMULATION SYSTEMS, INC.
Orlando, Florida	Delaware		100%
CUBIC TECHNOLOGIES DENMARK APS
Helsinger, Denmark	Denmark		100%	*
*(100% owned subsidiary of Cubic Defence New Zealand Limited)
CUBIC TECHNOLOGIES PTE. LTD.
Singapore	Singapore		100%	*
*(100% owned subsidiary of Cubic Defence New Zealand Limited)
CUBIC TRANSPORTATION SYSTEMS (AUSTRALIA) PTY LIMITED
New South Wales, Australia	Australia		100%	*
*(50% owned subsidiary of Cubic Corporation and 50% owned subsidiary of Cubic Transportation Systems, Inc.)
CUBIC TRANSPORTATION SYSTEMS CANADA, LTD.
Vancouver, B.C.	Canada		100%	*
*(100% owned subsidiary of Cubic Transportations Systems, Inc.)
CUBIC TRANSPORTATION SYSTEMS CHICAGO, INC.
Chicago, Illinois	Illinois		100%
CUBIC TRANSPORTATION SYSTEMS (DEUTSCHLAND) GmbH
Frankfurt, Germany	Germany		100%	*
*(100% owned subsidiary of Cubic (UK) Limited)
CUBIC TRANSPORTATION SYSTEMS, INC.
San Diego, California	California		100%

2

Subsidiary	Place of incorporation	Percentage owned
CUBIC TRANSPORTATION SYSTEMS (INDIA) PVT LIMITED
Hyderabad, India	India		100%
CUBIC TRANSPORTATION SYSTEMS LIMITED
London, England	England		100%	*
*(100% owned subsidiary of Cubic (U.K.) Limited)
CUBIC TRANSPORTATION SYSTEMS NORDIC AS
Bergen, Norway	Norway		100%	*
*(100% owned subsidiary of Cubic Transportation Systems Limited)
CUBIC TRANSPORTATION SYSTEMS SINGAPORE PTE. LTD.
Singapore	Singapore		100%	*
*(100% owned subsidiary of Cubic Transportation Systems Limited)
CUBIC TRANSPORTATION SYSTEMS TECHNOLOGIES HOLDING COMPANY
Cayman Islands, Grand Cayman	Cayman Islands		100%	*
*(100% owned subsidiary of Cubic Transportation Systems Limited)
CUBIC (U.K.) LIMITED
London, England	England		100%
CUBIC WORLDWIDE TECHNICAL SERVICES, INC.
San Diego, California	Delaware		100%
EACCESS LLC
San Diego, California	Delaware		100%
K2 SECURITY, INC.
Herndon, Virginia	Virginia		100%	*
*(100% owned subsidiary of Safe Harbor Holdings, Inc.)
NEK SERVICES, INC.
San Diego, California	California		100%
NEXTBUS, INC.
San Diego, California	Delaware		100%	*
*(100% owned subsidiary of Cubic Transportation Systems, Inc.)
OMEGA TRAINING GROUP, INC.
Columbus, Georgia	Georgia		100%
SAFE HARBOR HOLDINGS, INC.
Herndon, Virginia	Virginia		100%	*
*(100% owned subsidiary of Cubic Cyber Solutions, Inc.)

3

Subsidiary	Place of incorporation	Percentage owned
SAFE HARBOR SYSTEMS, LLC
Herndon, Virginia	Virginia		100%	*
*(100% owned subsidiary of Safe Harbor Holdings, Inc.)
TRANSACTION SYSTEMS LIMITED
London, England	England		50%	*
*(50% owned subsidiary of Cubic (U.K.) Limited)
XD SOLUTIONS, LLC
Herndon, Virginia	Virginia		100%	*
*(100% owned subsidiary of Safe Harbor Holdings, Inc.)
XIO STRATEGIES, INC.
Herndon, Virginia	Virginia		100%

4

QuickLinks

Exhibit 21.1

Subsidiaries of Cubic Corporation Place of incorporation and percentage owned