This object records the prefix length in bits of the network address flagged in a given FIB inconsistency record. Paired with cefInconsistencyPrefixAddr, this tells the admin the exact scope of the affected route, since a corrupted /32 host route affects one address while a corrupted /8 summary could affect an entire block of downstream traffic. A record showing prefix length 8 rather than 32 would immediately raise the severity in an admin's eyes, since it implies a much larger swath of addresses could be affected by that single inconsistency.