diff --git a/metropolis/node/allocs/net_ips.go b/metropolis/node/allocs/net_ips.go
new file mode 100644
index 0000000..b0d19a0
--- /dev/null
+++ b/metropolis/node/allocs/net_ips.go
@@ -0,0 +1,13 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package allocs
+
+import "net"
+
+// These are IP addresses used by various parts of Metropolis.
+var (
+	// Used by //metropolis/node/kubernetes as the DNS server IP for containers.
+	// Link-local IP space, 77 for ASCII M(onogon), 53 for DNS port.
+	IPContainerDNS = net.IPv4(169, 254, 77, 53)
+)