Exhibit 8.1

Organizational Structure—NTT’s Consolidated Subsidiaries as of March 31, 2017

Name	Country of Incorporation	Equity Held by NTT, Directly or Indirectly
Regional Communications Business
NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION	Japan		100.0%
NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION	Japan		100.0%
Long Distance and International Communications Business
NTT COMMUNICATIONS CORPORATION	Japan		100.0%
Dimension Data Holdings	UK		100.0%
NTT Security Corporation	Japan		100.0%
NTT America	USA		100.0%
NTT EUROPE	UK		100.0%
Lux e-shelter 1	Luxembourg		86.7%
Arkadin International	France		92.7%
RagingWire Data Centers	USA		80.1%
Virtela Technology Services	USA		100.0%
NETMAGIC SOLUTIONS PRIVATE LIMITED	India		81.6%
GYRON INTERNET	UK		100.0%
NTT Plala Inc.	Japan		95.4%
Spectrum Holdings	British Virgin Islands		100.0%
Mobile Communications Business
NTT DOCOMO, INC.	Japan		66.7%
Data Communications Business
NTT DATA CORPORATION	Japan		54.2%
NTT DATA	USA		54.2%
NTT DATA Services LLC	USA		54.2%
EVERIS PARTICIPACIONES	Spain		54.2%
NTT Data International	USA		54.2%
Other Business
NTT URBAN DEVELOPMENT CORPORATION	Japan		67.3%
NTT FINANCE CORPORATION	Japan		97.1%
NTT FACILITIES, INC.	Japan		100.0%
NTT COMWARE CORPORATION	Japan		100.0%
NTT ADVANCED TECHNOLOGY CORPORATION	Japan		100.0%
918 Others	Various		Various

*Note: Percentage of equity held shown represents the equity held by NTT, directly or indirectly, in relation to each of the companies’ outstanding shares (excluding treasury stock). Percentages are rounded to the nearest tenth.