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[6] [DFN[NTP]] は、[[インターネット]]を通じた[[時刻同期]]の[[プロトコル]]です。

* プロトコル

[26] [[NTP時刻]]

* 歴史

[12] [CITE@en[RFC 958 - Network Time Protocol (NTP)]], [TIME[2021-01-31T15:40:09.000Z]], [TIME[2021-03-10T06:34:38.967Z]] <https://tools.ietf.org/html/rfc958>

[13] [CITE@en[RFC 1059 - Network Time Protocol (version 1) specification and implementation]], [TIME[2021-01-24T15:49:45.000Z]], [TIME[2021-03-12T08:48:43.271Z]] <https://tools.ietf.org/html/rfc1059>

[18] [CITE[rfc1119.pdf]], [TIME[2020-11-28T21:33:03.000Z]], [TIME[2021-03-13T09:35:55.988Z]] <https://tools.ietf.org/pdf/rfc1119.pdf>

[15] [CITE[rfc1128.pdf]], [TIME[2020-12-14T04:53:11.000Z]], [TIME[2021-03-13T07:19:02.313Z]] <https://tools.ietf.org/pdf/rfc1128.pdf>

[14] [CITE[rfc1129.pdf]], [TIME[2021-02-08T13:57:58.000Z]], [TIME[2021-03-13T07:17:48.938Z]] <https://tools.ietf.org/pdf/rfc1129.pdf>

[16] [CITE@en[RFC 1165 - Network Time Protocol (NTP) over the OSI Remote Operations Service]], [TIME[2021-01-24T23:31:21.000Z]], [TIME[2021-03-13T08:03:08.600Z]] <https://tools.ietf.org/html/rfc1165>

[17] [CITE@en[RFC 1305 - Network Time Protocol (Version 3) Specification, Implementation and Analysis]], [TIME[2021-01-31T08:18:56.000Z]], [TIME[2021-03-13T09:34:54.014Z]] <https://tools.ietf.org/html/rfc1305>

[20] [CITE@en[RFC 1361 - Simple Network Time Protocol (SNTP)]], [TIME[2021-02-21T08:20:42.000Z]], [TIME[2021-03-14T03:56:38.145Z]] <https://tools.ietf.org/html/rfc1361>

[21] [CITE[RFC Errata Report » RFC Editor]], [TIME[2021-03-14T03:58:03.000Z]] <https://www.rfc-editor.org/errata_search.php?rfc=1361>

[19] [CITE@en[RFC 1589 - A Kernel Model for Precision Timekeeping]], [TIME[2021-01-24T09:25:39.000Z]], [TIME[2021-03-14T03:55:39.362Z]] <https://tools.ietf.org/html/rfc1589>

[22] [CITE@en[RFC 1769 - Simple Network Time Protocol (SNTP)]], [TIME[2021-01-24T08:14:03.000Z]], [TIME[2021-03-16T09:05:27.596Z]] <https://tools.ietf.org/html/rfc1769>

[23] [CITE@en[RFC 2030 - Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI]], [TIME[2021-01-24T11:07:32.000Z]], [TIME[2021-03-22T09:56:16.435Z]] <https://tools.ietf.org/html/rfc2030>

[24] [CITE[RFC Errata Report » RFC Editor]], [TIME[2021-03-22T09:56:33.000Z]] <https://www.rfc-editor.org/errata_search.php?rfc=2030>

[1] [CITE@en[ioerror/tlsdate]]
( ([TIME[2014-10-19 01:03:16 +09:00]] 版))
<https://github.com/ioerror/tlsdate>

[2] [CITE@ja[NTPプロジェクトの資金難、現在も改善せず | スラド デベロッパー]]
([TIME[2016-11-30 19:46:32 +09:00]])
<https://developers.srad.jp/story/16/11/30/0557259/>

[3] [CITE@ja[「時の翁」が握るNTPの運命 | スラド オープンソース]]
([TIME[2016-11-30 19:49:18 +09:00]])
<https://opensource.srad.jp/story/15/03/14/2216237/%E3%80%8C%E6%99%82%E3%81%AE%E7%BF%81%E3%80%8D%E3%81%8C%E6%8F%A1%E3%82%8BNTP%E3%81%AE%E9%81%8B%E5%91%BD>

[4] [CITE@en[ntp.org: Home of the Network Time Protocol]]
( ([[NTP Webmaster, webmaster@ntp.org]]著, [TIME[2017-03-04 12:52:30 +09:00]]))
<http://www.ntp.org/>

[FIG(quote)[
[FIGCAPTION[
[5] [CITE@ja[セイコーの「うるう秒」対策(第6回)うるう秒対策はもうお済ですか? | セイコーソリューションズ]]
([TIME[2017-05-19 21:17:51 +09:00]])
<http://www.seiko-sol.co.jp/leap-second/no-06/>
]FIGCAPTION]

> 4K/8Kの放送を支える次世代メディア伝送技術MMT(MPEG Media Transport)には、NTP形式の時刻情報が含まれ、「うるう秒」指示子が存在することにも注意が必要です。

]FIG]

[7] [[福岡大学公開NTPサービス]]

[8] [CITE@en[RFC 8633 - Network Time Protocol Best Current Practices]]
([TIME[2019-09-11 05:34:15 +09:00]])
<https://tools.ietf.org/html/rfc8633>

[9] [CITE@ja[NTPサーバの一部が2000年に逆戻りしてしまう事態が発生 - GIGAZINE]]
([TIME[2019-11-07 20:24:24 +09:00]])
<https://gigazine.net/news/20121121-computer-clocks-back-to-2000/>

[10] [CITE@ja[さくらインターネット、福岡大学と協力し 世界最速クラスのハードウェア 時刻同期(NTP)サーバーを自社開発 ~FPGAベースの公開NTPサービスをトライアル提供~ | さくらインターネット]]
([TIME[2020-03-18 21:55:26 +09:00]])
<https://www.sakura.ad.jp/information/pressreleases/2020/03/17/1968203094/>

[11] [CITE@ja[さくらインターネット | FPGA-NTP サーバ特設実験サイト]]
([TIME[2020-03-18 21:56:00 +09:00]])
<https://elab.sakura.ad.jp/ntp-trial/>

[25] [CITE@en[rfc4075]], [TIME[2021-07-05T05:48:50.000Z]] <https://datatracker.ietf.org/doc/html/rfc4075>

[27] [CITE@en[RFC 4330: Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI]], [TIME[2023-03-24T05:32:08.000Z]] <https://www.rfc-editor.org/rfc/rfc4330.html>

[28] [CITE[RFC Errata Report » RFC Editor]], [TIME[2023-03-24T05:33:04.000Z]] <https://www.rfc-editor.org/errata/rfc4330>

[29] [CITE@en[Authenticated Network Time Synchronization | USENIX]], [TIME[2023-04-27T11:34:01.000Z]], [TIME[2023-04-27T11:36:47.043Z]] <https://www.usenix.org/conference/usenixsecurity16/technical-sessions/presentation/dowling>

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