diff --git a/bin/tests/system/checkzone/zones/bad-_dns-svcb1.db b/bin/tests/system/checkzone/zones/bad-_dns-svcb1.db
new file mode 100644
index 0000000000..539db80d49
--- /dev/null
+++ b/bin/tests/system/checkzone/zones/bad-_dns-svcb1.db
@@ -0,0 +1,18 @@
+; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+;
+; SPDX-License-Identifier: MPL-2.0
+;
+; This Source Code Form is subject to the terms of the Mozilla Public
+; License, v. 2.0.  If a copy of the MPL was not distributed with this
+; file, you can obtain one at https://mozilla.org/MPL/2.0/.
+;
+; See the COPYRIGHT file distributed with this work for additional
+; information regarding copyright ownership.
+
+$TTL 600
+@		SOA	ns hostmaster 2011012708 3600 1200 604800 1200
+		NS	ns
+ns		A	192.0.2.1
+
+; no alpn specified
+_dns		SVCB	1 ns dohpath=/{?dns}
diff --git a/bin/tests/system/checkzone/zones/bad-_dns-svcb2.db b/bin/tests/system/checkzone/zones/bad-_dns-svcb2.db
new file mode 100644
index 0000000000..43cfb6bff2
--- /dev/null
+++ b/bin/tests/system/checkzone/zones/bad-_dns-svcb2.db
@@ -0,0 +1,18 @@
+; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+;
+; SPDX-License-Identifier: MPL-2.0
+;
+; This Source Code Form is subject to the terms of the Mozilla Public
+; License, v. 2.0.  If a copy of the MPL was not distributed with this
+; file, you can obtain one at https://mozilla.org/MPL/2.0/.
+;
+; See the COPYRIGHT file distributed with this work for additional
+; information regarding copyright ownership.
+
+$TTL 600
+@		SOA	ns hostmaster 2011012708 3600 1200 604800 1200
+		NS	ns
+ns		A	192.0.2.1
+
+; no dohpath
+_dns		SVCB	1 ns alpn=http/1.1
diff --git a/bin/tests/system/checkzone/zones/bad-_dns-svcb3.db b/bin/tests/system/checkzone/zones/bad-_dns-svcb3.db
new file mode 100644
index 0000000000..8323af525d
--- /dev/null
+++ b/bin/tests/system/checkzone/zones/bad-_dns-svcb3.db
@@ -0,0 +1,18 @@
+; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+;
+; SPDX-License-Identifier: MPL-2.0
+;
+; This Source Code Form is subject to the terms of the Mozilla Public
+; License, v. 2.0.  If a copy of the MPL was not distributed with this
+; file, you can obtain one at https://mozilla.org/MPL/2.0/.
+;
+; See the COPYRIGHT file distributed with this work for additional
+; information regarding copyright ownership.
+
+$TTL 600
+@		SOA	ns hostmaster 2011012708 3600 1200 604800 1200
+		NS	ns
+ns		A	192.0.2.1
+
+; no dohpath
+_dns		SVCB	1 ns alpn=h2
diff --git a/bin/tests/system/checkzone/zones/bad-_dns-svcb4.db b/bin/tests/system/checkzone/zones/bad-_dns-svcb4.db
new file mode 100644
index 0000000000..389f1a317f
--- /dev/null
+++ b/bin/tests/system/checkzone/zones/bad-_dns-svcb4.db
@@ -0,0 +1,18 @@
+; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+;
+; SPDX-License-Identifier: MPL-2.0
+;
+; This Source Code Form is subject to the terms of the Mozilla Public
+; License, v. 2.0.  If a copy of the MPL was not distributed with this
+; file, you can obtain one at https://mozilla.org/MPL/2.0/.
+;
+; See the COPYRIGHT file distributed with this work for additional
+; information regarding copyright ownership.
+
+$TTL 600
+@		SOA	ns hostmaster 2011012708 3600 1200 604800 1200
+		NS	ns
+ns		A	192.0.2.1
+
+; no dohpath
+_dns		SVCB	1 ns alpn=h3
diff --git a/bin/tests/system/checkzone/zones/bad-_dns-svcb5.db b/bin/tests/system/checkzone/zones/bad-_dns-svcb5.db
new file mode 100644
index 0000000000..50265a34a2
--- /dev/null
+++ b/bin/tests/system/checkzone/zones/bad-_dns-svcb5.db
@@ -0,0 +1,18 @@
+; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+;
+; SPDX-License-Identifier: MPL-2.0
+;
+; This Source Code Form is subject to the terms of the Mozilla Public
+; License, v. 2.0.  If a copy of the MPL was not distributed with this
+; file, you can obtain one at https://mozilla.org/MPL/2.0/.
+;
+; See the COPYRIGHT file distributed with this work for additional
+; information regarding copyright ownership.
+
+$TTL 600
+@		SOA	ns hostmaster 2011012708 3600 1200 604800 1200
+		NS	ns
+ns		A	192.0.2.1
+
+; no dohpath
+_443._dns		SVCB	1 ns alpn=h1\\,h2
diff --git a/bin/tests/system/checkzone/zones/bad-_dns-svcb6.db b/bin/tests/system/checkzone/zones/bad-_dns-svcb6.db
new file mode 100644
index 0000000000..7a563dfa52
--- /dev/null
+++ b/bin/tests/system/checkzone/zones/bad-_dns-svcb6.db
@@ -0,0 +1,18 @@
+; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+;
+; SPDX-License-Identifier: MPL-2.0
+;
+; This Source Code Form is subject to the terms of the Mozilla Public
+; License, v. 2.0.  If a copy of the MPL was not distributed with this
+; file, you can obtain one at https://mozilla.org/MPL/2.0/.
+;
+; See the COPYRIGHT file distributed with this work for additional
+; information regarding copyright ownership.
+
+$TTL 600
+@		SOA	ns hostmaster 2011012708 3600 1200 604800 1200
+		NS	ns
+ns		A	192.0.2.1
+
+; no dohpath
+_443._dns		SVCB	1 ns alpn=x1\\,h2