Your SPF record has a limit of 10 DNS Lookups. Every time you add a new ‘mechanism’ in your record, you require a new lookup. You need to use mechanisms to add new IP addresses.
Resolve SPF Errors with One Click Automatic PowerSPF
Introducing PowerSPF record, the one-click auto AutoSPF DNS record optimizer tool. Enjoy error free SPF record and manage unlimited SPF records easily.