EXHIBIT 21.1

List of Subsidiaries of Nine Energy Service, Inc.

Name	Jurisdiction
Beckman Production Services, Inc.	Delaware
Beckman Production Services, Inc.	Michigan
Big Lake Service, LLC	Delaware
Big Lake Services Holdco, LLC	Delaware
CDK Perforating, LLC	Texas
Crest Pumping Technologies, LLC	Delaware
Dak-Tana Wireline, LLC	Delaware
Frac Technology AS	Norway
Magnum Oil Tools Canada Ltd.	Alberta, Canada
Magnum Oil Tools GP, LLC	Texas
Magnum Oil Tools International, LTD	Texas
MOTI Holdco, LLC	Delaware
Nine Downhole Norway AS	Norway
Nine Downhole Technologies, LLC	Delaware
Nine Energy Canada Inc.	Alberta, Canada
Nine Energy Service, LLC	Delaware
Northern Production Company, LLC	Wyoming
Northern States Completions, Inc.	Delaware
Peak Pressure Control, LLC	Texas
R & S Well Service, Inc.	Wyoming
RedZone Coil Tubing, LLC	Texas
RedZone Holdco, LLC	Delaware
SJL Well Service, LLC	Oklahoma