diff --git a/dev-guide/host-port-registry.md b/dev-guide/host-port-registry.md
index 13860c2320..c7084a90ac 100644
--- a/dev-guide/host-port-registry.md
+++ b/dev-guide/host-port-registry.md
@@ -90,6 +90,7 @@ Ports are assumed to be used on all nodes in all clusters unless otherwise speci
 | 9110      | sriov-network-metrics-exporter                  | HTTPS    |                    | sdn           | 4.16  | metrics                                                                                                          |
 | 9121      | metallb                                         |          |                    | sdn           | 4.9   | metrics                                                                                                          |
 | 9122      | metallb                                         |          |                    | sdn           | 4.9   | leader election protocol                                                                                         |
+| 9123      | frr-k8                                          | HTTPS    |                    | sdn           | 4.19  | webhook                                                                                                          |
 | 9191      | cluster-machine-approver                        |          |                    | cluster infra | 4.3   | metrics                                                                                                          |
 | 9192      | cluster-machine-approver                        |          |                    | cluster infra | 4.3   | metrics                                                                                                          |
 | 9193      | cluster-machine-approver-capi                   |          |                    | cluster infra | 4.11  | metrics                                                                                                          |