> Source: [sk149492](https://support.checkpoint.com/results/sk/sk149492)

# sk149492 - Unable to add certain prefix lengths to a prefix-list configuration

| Property | Value |
|----------|-------|
| Solution ID | sk149492 |
| Date Created | 2019-03-19 |
| Last Modified | 2019-09-03 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |
| OS | Gaia |

## Symptoms

- Attempting to add certain prefix lengths to a prefix-list configuration fails with the following error messages:

```

GW> set prefix-list test sequence-number 10 prefix 0.0.0.0/1 exact
CLINFR0329 Prefix-list: Invalid prefix / mask length 0.0.0.0/1
GW > set prefix-list test sequence-number 10 prefix 0.0.0.0/2 exact
CLINFR0329 Prefix-list: Invalid prefix / mask length 0.0.0.0/2
```

```

GW > set prefix-list test sequence-number 10 prefix 224.0.0.0/3 exact
CLINFR0409 IPv4 unicast netmask check fails: Address 224.0.0.0/3 in multicast range
set prefix-list test sequence-number 10 prefix 224.0.0.0/3
----------------------------------------^^^^^^^^^^^^^^^^^^
```

## Solution

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