diff --git a/libs/tools.py b/libs/tools.py
index bee29d8..0f60c36 100644
--- a/libs/tools.py
+++ b/libs/tools.py
@@ -1,4 +1,4 @@
-from ipaddress import ip_address, IPv4Address
+from ipaddress import ip_address, ip_network, IPv4Address, IPv4Network
 
 from bundlewrap.exceptions import NoSuchGroup, NoSuchNode
 from bundlewrap.utils.text import bold, red
@@ -16,9 +16,9 @@ def resolve_identifier(repo, identifier):
             nodes = repo.nodes_in_group(identifier)
         except NoSuchGroup:
             try:
-                ip = ip_address(identifier)
+                ip = ip_network(identifier)
 
-                if isinstance(ip, IPv4Address):
+                if isinstance(ip, IPv4Network):
                     return {'ipv4': {ip}, 'ipv6': set()}
                 else:
                     return {'ipv4': set(), 'ipv6': {ip}}
@@ -29,7 +29,7 @@ def resolve_identifier(repo, identifier):
                     i=identifier,
                     e=str(e),
                 ))
-                return {'ipv4': set(), 'ipv6': set()}
+                raise
 
     found_ips = set()
     for node in nodes: