diff --git a/host-registry.nix b/host-registry.nix
index 71fb5ef0..c479fe89 100644
--- a/host-registry.nix
+++ b/host-registry.nix
@@ -80,6 +80,8 @@ rec {
     };
 
     matemat = {
+      ip4 = "172.20.73.21";
+      ip6 = "2a00:8180:2c00:282:f82b:1bff:fedc:8572";
       publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBa07c4NnU1TGX1SMNea9e1d4nMtc0OS4gJLmTA3g/fe";
     };