Here is a reference list to the current Debian and Devuan repository. You can copy and paste any single list from Stable/Testing/Unstable for Debian and any single list from. To ensure proper signing, be sure to install either Debian-Keyring or Devuan-Keyring depending on what repository is being added.
###### Debian Stable Repos deb http://deb.debian.org/debian/ stable main contrib non-free deb-src http://deb.debian.org/debian/ stable main contrib non-free deb http://deb.debian.org/debian/ stable-updates main contrib non-free deb-src http://deb.debian.org/debian/ stable-updates main contrib non-free deb http://deb.debian.org/debian-security stable/updates main deb-src http://deb.debian.org/debian-security stable/updates main deb http://ftp.debian.org/debian stable-backports main deb-src http://ftp.debian.org/debian stable-backports main ###### Debian Testing Repos deb http://deb.debian.org/debian/ testing main contrib non-free deb-src http://deb.debian.org/debian/ testing main contrib non-free deb http://deb.debian.org/debian/ testing-updates main contrib non-free deb-src http://deb.debian.org/debian/ testing-updates main contrib non-free deb http://deb.debian.org/debian-security testing-security main deb-src http://deb.debian.org/debian-security testing-security main ###### Debian Unstable Repos deb http://deb.debian.org/debian/ unstable main contrib non-free deb-src http://deb.debian.org/debian/ unstable main contrib non-free ###### Devuan Experimental deb http://deb.devuan.org/devuan experimental main deb-src http://deb.devuan.org/devuan experimental main ###### Devuan Ceres (Unstable) deb http://deb.devuan.org/merged ceres main ###### Devuan Daedalus (Testing) deb http://deb.devuan.org/merged daedalus main deb http://deb.devuan.org/merged daedalus-updates main deb http://deb.devuan.org/merged daedalus-security main ###### Devuan 4.0 Chimaera deb http://deb.devuan.org/merged chimaera main deb http://deb.devuan.org/merged chimaera-updates main deb http://deb.devuan.org/merged chimaera-security main ###### Devuan 3.1 Beowulf deb http://deb.devuan.org/merged beowulf main deb http://deb.devuan.org/merged beowulf-updates main deb http://deb.devuan.org/merged beowulf-security main ###### Devuan 2.1 ASCII deb http://deb.devuan.org/merged ascii main deb http://deb.devuan.org/merged ascii-updates main deb http://deb.devuan.org/merged ascii-security main ###### Devuan 1.0.0 Jessie deb http://archive.devuan.org/merged jessie main ###### Devuan Updates deb http://deb.devuan.org/merged "release-codename"-updates main deb-src http://deb.devuan.org/merged "release-codename"-updates main ###### Devuan Proposed-Updates deb http://deb.devuan.org/devuan "release-codename"-proposed-updates main deb-src http://deb.devuan.org/devuan "release-codename"-proposed-updates main ###### Devuan Backports deb http://deb.devuan.org/merged "release-codename"-backports main deb-src http://deb.devuan.org/merged "release-codename"-backports main