I found this on Twitter:

-X1's members profile-
Han Seungwoo
Birth Name: Han Seungwoo
Position: Leader, Main Vocalist
Birthday: December 24, 1994
Company: Plan A Entertainment
Cho Seungyoun
Birth Name: Cho Seungyoun
Position: Lead Vocalist, Lead Rapper
Birthday: August 5, 1996
Company: Yuehua Entertainment
Kim Wooseok
Birth Name: Kim Wooseok
Position: Lead Vocalist
Birthday: October 27, 1996
Company: TOP Media
Kim Yohan
Birth Name: Kim Yohan
Position: Center, Sub Vocalist
Birthday: September 22, 1999
Company: OUI Entertainment
Lee Hangyul
Birth Name: Lee Hangyul
Position: Main Dancer, Sub Vocalist
Birthday: December 7, 1999
Company: MBK Entertainment
Cha Junho
Birth Name: Cha Junho
Position: Sub Vocalist
Birthday: July 9, 2002
Company: Woollim Entertainment
Son Dongpyo
Birth Name: Son Dongpyo
Position: Lead Dancer, Sub Vocalist
Birthday: September 9, 2002
Company: DSP Media
Kang Minhee
Birth Name: Kang Minhee
Position: Lead Vocalist
Birthday: September 17, 2002
Company: Starship Entertainment
Lee Eunsang
Birth Name: Lee Eunsang
Position: Sub Vocalist
Birthday: October 26, 2002
Company: Brand New Music
Song Hyungjun
Birth Name: Song Hyeongjun
Position: Lead Dancer, Sub Rapper
Birthday: November 30, 2002
Company: Starship Entertainment
Nam Dohyun
Position: Main Rapper, Maknae
Birthday: November 10, 2004
Company: MBK Entertainment
Anyway I don't know if it's official or no. And what do you think? What's your opinion of their position?

-X1's members profile-
Han Seungwoo
Birth Name: Han Seungwoo
Position: Leader, Main Vocalist
Birthday: December 24, 1994
Company: Plan A Entertainment
Cho Seungyoun
Birth Name: Cho Seungyoun
Position: Lead Vocalist, Lead Rapper
Birthday: August 5, 1996
Company: Yuehua Entertainment
Kim Wooseok
Birth Name: Kim Wooseok
Position: Lead Vocalist
Birthday: October 27, 1996
Company: TOP Media
Kim Yohan
Birth Name: Kim Yohan
Position: Center, Sub Vocalist
Birthday: September 22, 1999
Company: OUI Entertainment
Lee Hangyul
Birth Name: Lee Hangyul
Position: Main Dancer, Sub Vocalist
Birthday: December 7, 1999
Company: MBK Entertainment
Cha Junho
Birth Name: Cha Junho
Position: Sub Vocalist
Birthday: July 9, 2002
Company: Woollim Entertainment
Son Dongpyo
Birth Name: Son Dongpyo
Position: Lead Dancer, Sub Vocalist
Birthday: September 9, 2002
Company: DSP Media
Kang Minhee
Birth Name: Kang Minhee
Position: Lead Vocalist
Birthday: September 17, 2002
Company: Starship Entertainment
Lee Eunsang
Birth Name: Lee Eunsang
Position: Sub Vocalist
Birthday: October 26, 2002
Company: Brand New Music
Song Hyungjun
Birth Name: Song Hyeongjun
Position: Lead Dancer, Sub Rapper
Birthday: November 30, 2002
Company: Starship Entertainment
Nam Dohyun
Position: Main Rapper, Maknae
Birthday: November 10, 2004
Company: MBK Entertainment
Anyway I don't know if it's official or no. And what do you think? What's your opinion of their position?