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https://m.aqr.af/system/media_attachments/files/109/403/721/744/845/078/original/5a5bd83ee3af4125.png
NTP Server Online Test Tool (IPv4 & IPv6)
https://network-tools.webwiz.net/ntp-server-test.htm
ほえー便利
ドメイン指定で同期はできるみたいだけど、IPv6のほうで Reverse DNS Hostname が出てこないのはなんか気になる
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