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VPS？ GMO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
