1. whois

a. [Domain Name]                DOCOMO.NE.JP
d. [Network Service Name]       i mode service
l. [Organization Type]          Network Service
m. [Administrative Contact]     JN9094JP
n. [Technical Contact]          JN9094JP
p. [Name Server]                ns001.docomo.ne.jp
p. [Name Server]                ns002.docomo.ne.jp
s. [Signing Key]                
[State]                         Connected (2023/07/31)
[Registered Date]               1998/07/17
[Connected Date]                1998/07/30
[Last Update]                   2022/08/01 01:02:16 (JST)

ns002.docomo.ne.jp.     86400   IN      A       49.102.160.24
ns001.docomo.ne.jp.     86400   IN      A       49.102.160.23

docomo.ne.jp.           3204    IN      TXT     "v=spf1 +ip4:203.138.203.0/24 
  +ip4:210.153.87.192/29 +ip4:210.153.87.224/29 ~all"

1.203.138.203.in-addr.arpa. 3600 IN PTR mail101.docomo.ne.jp.

203.138.203.16

2. history

$ dig -x 210.153.87.192
210.153.87.224

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