diff --git a/hosts/nachtigall/apps/matrix/irc.nix b/hosts/nachtigall/apps/matrix/irc.nix
new file mode 100644
index 0000000..b00a5b0
--- /dev/null
+++ b/hosts/nachtigall/apps/matrix/irc.nix
@@ -0,0 +1,114 @@
+{lib, ...}:
+{
+  services.matrix-appservice-irc = {
+    enable = true;
+    localpart = "irc_bot";
+    port = 8010;
+    registrationUrl = "http://localhost:8010";
+    settings = {
+      homeserver = {
+        # TODO: Use the port from synapse config
+        domain = "test.pub.solar";
+        url = "http://127.0.0.1:8008";
+        media_url = "https://matrix.test.pub.solar";
+        enablePresence = false;
+      };
+      ircService = {
+        ident = {
+          address = "::";
+          enabled = false;
+          port = 1113;
+        };
+        logging = {
+          level = "debug";
+          maxFiles = 5;
+          toCosole = true;
+        };
+        matrixHandler = {
+          eventCacheSize = 4096;
+        };
+        metrics = {
+          enabled = true;
+          remoteUserAgeBuckets = [ "1h" "1d" "1w" ];
+        };
+        provisioning = {
+          enabled = false;
+          requestTimeoutSeconds = 300;
+        };
+        servers =
+          let
+            commonConfig = {
+              allowExpiredCerts = false;
+              botConfig = {
+                enabled = false;
+                joinChannelsIfNoUsers = false;
+                nick = "MatrixBot";
+              };
+              dynamicChannels = {
+                createAlias = true;
+                enabled = true;
+                federate = true;
+                joinRule = "public";
+                published = true;
+              };
+              ircClients = {
+                allowNickChanges = true;
+                concurrentReconnectLimit = 50;
+                idleTimeout = 10800;
+                lineLimit = 3;
+                maxClients = 30;
+                nickTemplate = "$DISPLAY[m]";
+                reconnectIntervalMs = 5000;
+              };
+              matrixClients = {
+                joinAttempts = -1;
+              };
+              membershipLists = {
+                enabled = true;
+                floodDelayMs = 10000;
+                global = {
+                  ircToMatrix = {
+                    incremental = true;
+                    initial = true;
+                  };
+                  matrixToIrc = {
+                    incremental = true;
+                    initial = true;
+                  };
+                };
+              };
+              port = 6697;
+              privateMessages = {
+                enabled = true;
+                federate = true;
+              };
+              sasl = false;
+              sendConnectionMessages = true;
+              ssl = true;
+            };
+          in {
+            # TODO: Remove freenode if nobody uses it.
+            "irc.freenode.net" = lib.attrsets.recursiveUpdate commonConfig {
+              name = "freenode";
+              dynamicChannels.groupId = "+freenode.net:localhost";
+              # TODO: if someone uses freenode, we should specify freenode in the user display names insted of just "IRC";
+              matrixClients.displayName = "$NICK (IRC)";
+              dynamicChannels.aliasTemplate = "#irc_$CHANNEL";
+              matrixClients.userTemplate = "@irc_$NICK";
+            };
+            "irc.libera.chat" = lib.attrsets.recursiveUpdate commonConfig {
+              name = "libera";
+              dynamicChannels.groupId = "+libera.chat:localhost";
+              matrixClients.displayName = "$NICK (LIBERA-IRC)";
+            };
+            "irc.scratch-network.net" = lib.attrsets.recursiveUpdate commonConfig {
+              name = "scratch";
+              matrixClients.displayName = "$NICK (SCRATCH-IRC)";
+              dynamicChannels.groupId = "+scratch-network.net:localhost";
+            };
+          };
+      };
+    };
+  };
+}
+
diff --git a/hosts/nachtigall/apps/matrix/synapse.nix b/hosts/nachtigall/apps/matrix/synapse.nix
index d0b2fe2..a44dec0 100644
--- a/hosts/nachtigall/apps/matrix/synapse.nix
+++ b/hosts/nachtigall/apps/matrix/synapse.nix
@@ -209,7 +209,7 @@ in {
 
       app_service_config_files = [
         "/var/lib/matrix-synapse/telegram-registration.yaml"
-        # "/matrix-appservice-irc-registration.yaml"
+        "/var/lib/matrix-appservice-irc/registration.yml"
         # "/matrix-appservice-slack-registration.yaml"
         # "/hookshot-registration.yml"
         # "/matrix-mautrix-signal-registration.yaml"
diff --git a/hosts/nachtigall/default.nix b/hosts/nachtigall/default.nix
index 4fd0578..1c7361f 100644
--- a/hosts/nachtigall/default.nix
+++ b/hosts/nachtigall/default.nix
@@ -27,6 +27,7 @@
 
       ./apps/matrix/mautrix-telegram.nix
       ./apps/matrix/synapse.nix
+      ./apps/matrix/irc.nix
       ./apps/nginx-matrix.nix
 
       # Override with module from nixos-unstable, needs to be added