# Per-client blocking example
In this example, we describe how to set up a blocking rule for three specific clients. All remaining (and newly added) clients in the network are "unmanaged", i.e., they use Pi-hole as usual. The examples shown here are built upon each other, i.e., example 5 might make no sense without the context of example 3.
Don't forget to run
```bash
pihole restartdns reload-lists
```
after your database modifications to have FTL flush its internal domain-blocking cache (separate from the DNS cache).
## Prerequisites
1. **Add three groups.**
The `Unassociated` group has a special meaning and cannot be deleted. All domains, clients, and adlists without a specific group assignment are automatically managed through this group. Disabling this group will disable Pi-hole blocking for all unmanaged devices.
Raw database instructions
```sql
INSERT INTO "group" (id, name) VALUES (1, 'Group 1');
INSERT INTO "group" (id, name) VALUES (2, 'Group 2');
INSERT INTO "group" (id, name) VALUES (3, 'Group 3');
```
Raw database instructions
```sql
INSERT INTO client (id, ip) VALUES (1, '192.168.0.101');
INSERT INTO client (id, ip) VALUES (2, '192.168.0.102');
INSERT INTO client (id, ip) VALUES (3, '192.168.0.103');
```
Raw database instructions
```sql
INSERT INTO client_by_group (client_id, group_id) VALUES (1, 1);
INSERT INTO client_by_group (client_id, group_id) VALUES (2, 2);
INSERT INTO client_by_group (client_id, group_id) VALUES (3, 3);
```
Raw database instructions
```sql
DELETE FROM client_by_group WHERE client_id = 1 AND group_id = 0;
```
Raw database instructions
```sql
INSERT INTO adlist_by_group (adlist_id, group_id) VALUES (1,1);
```
Raw database instructions
```sql
INSERT INTO domainlist (type, domain, comment) VALUES (1, 'blacklisted.com', 'Blacklisted for members of group 1');
```
Raw database instructions
```sql
INSERT INTO domainlist_by_group (domainlist_id, group_id) VALUES (1, 1);
```
(the `domainlist_id` might be different for you, check with `SELECT last_insert_rowid();` after step 1)
Raw database instructions
```sql
DELETE FROM domainlist_by_group WHERE domainlist_id = 1 AND group_id = 0;
```
(the `domainlist_id` might be different for you, see above)
Raw database instructions
```sql
INSERT INTO domainlist (type, domain, comment) VALUES (0, 'doubleclick.net', 'Whitelisted for members of group 2');
```
Raw database instructions
```sql
DELETE FROM domainlist_by_group WHERE domainlist_id = 2 AND group_id = 0;
```
Raw database instructions
```sql
INSERT INTO domainlist_by_group (domainlist_id, group_id) VALUES (2, 2);
```
(the `domainlist_id` might be different for you, check with `SELECT last_insert_rowid();` after step 1)