{"nftables": [{"metainfo": {"version": "VERSION", "release_name": "RELEASE_NAME", "json_schema_version": 1}}, {"table": {"family": "ip", "name": "x", "handle": 0}}, {"set": {"family": "ip", "name": "y", "table": "x", "type": "ipv4_addr", "handle": 0, "flags": ["interval"], "elem": [{"prefix": {"addr": "192.168.4.0", "len": 24}}]}}]}