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Gehirn 4点分散したDNSサーバー

Gehirn DNSというサービスがお気に入りです。
http://www.gehirn.jp/dns.html


個人的にお気に入りで使っていたのですが、
会社でその話しをしたら業務でも試験的に利用してみようということになったので
特徴や仕様周りを再確認してみました。

特徴

  • 2ドメインまで無料(月額315円でドメイン数無制限!)
  • レコード数無制限
  • DNSサーバーが4拠点に分散
  • API操作可
  • BIND形式のゾーンファイルのインポート・エクスポートが可能
  • 管理画面が使いやすい

といいことづくめのDNSサービスです。

4拠点の分散

データセンター、回線事業者、IPアドレスセグメントをすべてのサーバで分離させています。
東京×2、大阪、イギリスの4拠点に配置し、各DNSサーバにも別々のドメインネームを割り当てています。
トップレベルドメインも .jp .com .co.uk を使用し、安定性を高めています。

公式HPより。
この4拠点について調べてみました。

4つのNS

管理画面でドメインを登録すると以下の4つのNSを指定するように表示されます。

ns.gehirn.jp
ns.gehirn.co.uk
ns.gehirndns.com
ns.securedns.jp

その4つのNSのIPから4拠点について確認してみました。

※このNSのドメインやIPは2013年6月17日時点の情報です。
NSのドメインはご自身の管理画面に表示されるものに従って設定してください。

結果

NS IPアドレス サーバー(おそらく)
ns.gehirn.jp 219.94.248.160 さくらVPS
ns.gehirn.co.uk 176.58.98.178 Linode
ns.gehirndns.com 203.189.97.139 お名前VPSGMOクラウドVPS
ns.securedns.jp 180.235.229.162 CPI


利用サーバー(サービス)は不明確ですが、ちゃんと国内外で分散配置されているようです!

ns.gehirn.jp

219.94.248.160

[Querying whois.apnic.net]
[whois.apnic.net]
% [whois.apnic.net node-2]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

inetnum:        219.94.128.0 - 219.94.255.255
netname:        SAKURA-OSAKA
descr:          SAKURA Internet Inc.
descr:          1-8-14, Minami Honmachi, Chuo-ku, Osaka 541-0054, Japan
country:        JP
admin-c:        JNIC1-AP
tech-c:         JNIC1-AP
status:         ALLOCATED PORTABLE
remarks:        Email address for spam or abuse complaints : abuse@sakura.ad.jp
mnt-by:         MAINT-JPNIC
mnt-lower:      MAINT-JPNIC
changed:        hm-changed@apnic.net 20041013
changed:        ip-apnic@nic.ad.jp 20070523
changed:        ip-apnic@nic.ad.jp 20090109
source:         APNIC

role:           Japan Network Information Center
address:        Urbannet-Kanda Bldg 4F
address:        3-6-2 Uchi-Kanda
address:        Chiyoda-ku, Tokyo 101-0047,Japan
country:        JP
phone:          +81-3-5297-2311
fax-no:         +81-3-5297-2312
e-mail:         hostmaster@nic.ad.jp
admin-c:        JI13-AP
tech-c:         JE53-AP
nic-hdl:        JNIC1-AP
mnt-by:         MAINT-JPNIC
changed:        hm-changed@apnic.net 20041222
changed:        hm-changed@apnic.net 20050324
changed:        ip-apnic@nic.ad.jp 20051027
changed:        ip-apnic@nic.ad.jp 20120828
source:         APNIC

inetnum:        219.94.248.0 - 219.94.248.255
netname:        SAKURA-NET
descr:          SAKURA Internet Inc.
country:        JP
admin-c:        KT749JP
tech-c:         JP00072233
remarks:        This information has been partially mirrored by APNIC from
remarks:        JPNIC. To obtain more specific information, please use the
remarks:        JPNIC WHOIS Gateway at
remarks:        http://www.nic.ad.jp/en/db/whois/en-gateway.html or
remarks:        whois.nic.ad.jp for WHOIS client. (The WHOIS client
remarks:        defaults to Japanese output, use the /e switch for English
remarks:        output)
changed:        apnic-ftp@nic.ad.jp 20120327
source:         JPNIC


ns.gehirn.co.uk

176.58.98.178

[Querying whois.arin.net]
[Redirected to whois.ripe.net:43]
[Querying whois.ripe.net]
[whois.ripe.net]
% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See http://www.ripe.net/db/support/db-terms-conditions.pdf

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '176.58.96.0 - 176.58.103.255'

inetnum:        176.58.96.0 - 176.58.103.255
netname:        LINODE-UK
descr:          Linode, LLC
country:        GB
admin-c:        JS10295-RIPE
tech-c:         JS10295-RIPE
tech-c:         LA538-RIPE
remarks:        This block is used for static customer allocations
remarks:        Please send abuse reports to abuse@linode.com
status:         ASSIGNED PA
mnt-by:         Linode-mnt
mnt-domains:    Linode-mnt
source:         RIPE # Filtered

person:         James Sinclair
address:        329 E. Jimmie Leeds Road, Suite A, Galloway, NJ 08205, USA
phone:          +1 609 593 7103
nic-hdl:        JS10295-RIPE
mnt-by:         Linode-mnt
source:         RIPE # Filtered

person:         Linode Abuse Support
address:        329 E. Jimmie Leeds Road, Suite A, Galloway, NJ 08205, USA
phone:          +16095937103
abuse-mailbox:  abuse@linode.com
nic-hdl:        LA538-RIPE
mnt-by:         Linode-mnt
source:         RIPE # Filtered

% Information related to '176.58.96.0/19AS15830'

route:          176.58.96.0/19
descr:          Linode-3
origin:         AS15830
mnt-by:         Linode-mnt
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.66 (WHOIS4)


ns.gehirndns.com

203.189.97.139

[Querying whois.apnic.net]
[whois.apnic.net]
% [whois.apnic.net node-5]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

inetnum:        203.189.96.0 - 203.189.111.255
netname:        interQ
descr:          GMO Internet, Inc.
descr:          CERULEAN TOWER, Sakuragicho 26-1,
descr:          Shibyua-ku 150-8512, Tokyo, Japan
country:        JP
admin-c:        JNIC1-AP
tech-c:         JNIC1-AP
status:         ALLOCATED PORTABLE
remarks:        Email address for spam or abuse complaints : abuse@gmo.jp
changed:        hm-changed@apnic.net 20110408
mnt-irt:        IRT-JPNIC-JP
mnt-by:         MAINT-JPNIC
mnt-lower:      MAINT-JPNIC
source:         APNIC

role:           Japan Network Information Center
address:        Urbannet-Kanda Bldg 4F
address:        3-6-2 Uchi-Kanda
address:        Chiyoda-ku, Tokyo 101-0047,Japan
country:        JP
phone:          +81-3-5297-2311
fax-no:         +81-3-5297-2312
e-mail:         hostmaster@nic.ad.jp
admin-c:        JI13-AP
tech-c:         JE53-AP
nic-hdl:        JNIC1-AP
mnt-by:         MAINT-JPNIC
changed:        hm-changed@apnic.net 20041222
changed:        hm-changed@apnic.net 20050324
changed:        ip-apnic@nic.ad.jp 20051027
changed:        ip-apnic@nic.ad.jp 20120828
source:         APNIC

inetnum:        203.189.97.0 - 203.189.97.255
netname:        GMOVPS-UNIT1
descr:          GMO Internet,Inc.
country:        JP
admin-c:        JP00080271
tech-c:         JP00080271
remarks:        This information has been partially mirrored by APNIC from
remarks:        JPNIC. To obtain more specific information, please use the
remarks:        JPNIC WHOIS Gateway at
remarks:        http://www.nic.ad.jp/en/db/whois/en-gateway.html or
remarks:        whois.nic.ad.jp for WHOIS client. (The WHOIS client
remarks:        defaults to Japanese output, use the /e switch for English
remarks:        output)
changed:        apnic-ftp@nic.ad.jp 20110412
changed:        apnic-ftp@nic.ad.jp 20120524
source:         JPNIC


ns.securedns.jp

180.235.229.162

[Querying whois.arin.net]
[Redirected to whois.apnic.net]
[Querying whois.apnic.net]
[whois.apnic.net]
% [whois.apnic.net node-3]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

inetnum:        180.235.224.0 - 180.235.255.255
netname:        CPI
descr:          KDDI Web Communications Inc.
descr:          Sumitomo R&D Kojimachi Bldg. No.3,3-6 Kojimachi,Chiyoda-ku,Tokyo 102-0083,Japan
country:        JP
admin-c:        JNIC1-AP
tech-c:         JNIC1-AP
status:         ALLOCATED PORTABLE
remarks:        Email address for spam or abuse complaints : abuse@cpi.ad.jp
mnt-irt:        IRT-JPNIC-JP
mnt-by:         MAINT-JPNIC
mnt-lower:      MAINT-JPNIC
changed:        hm-changed@apnic.net 20110222
source:         APNIC

role:           Japan Network Information Center
address:        Urbannet-Kanda Bldg 4F
address:        3-6-2 Uchi-Kanda
address:        Chiyoda-ku, Tokyo 101-0047,Japan
country:        JP
phone:          +81-3-5297-2311
fax-no:         +81-3-5297-2312
e-mail:         hostmaster@nic.ad.jp
admin-c:        JI13-AP
tech-c:         JE53-AP
nic-hdl:        JNIC1-AP
mnt-by:         MAINT-JPNIC
changed:        hm-changed@apnic.net 20041222
changed:        hm-changed@apnic.net 20050324
changed:        ip-apnic@nic.ad.jp 20051027
changed:        ip-apnic@nic.ad.jp 20120828
source:         APNIC

inetnum:        180.235.224.0 - 180.235.231.255
netname:        CPI-NET
descr:          KDDI Web Communications Inc.
country:        JP
admin-c:        YM12747JP
tech-c:         YM12747JP
remarks:        This information has been partially mirrored by APNIC from
remarks:        JPNIC. To obtain more specific information, please use the
remarks:        JPNIC WHOIS Gateway at
remarks:        http://www.nic.ad.jp/en/db/whois/en-gateway.html or
remarks:        whois.nic.ad.jp for WHOIS client. (The WHOIS client
remarks:        defaults to Japanese output, use the /e switch for English
remarks:        output)
changed:        apnic-ftp@nic.ad.jp 20110223
source:         JPNIC