How to split one big list into smaller lists

When a Lead list grows past the point where you can manage it as a single unit, the List Split utility is the right tool. It takes one source list and divides its records into several new lists, each holding up to the number of leads you specify. The process takes a few fields to fill in and runs quickly — here is how to do it correctly from start to finish.

Before you start

Check two things before opening List Split. First, know your source list's current total lead count — you can see this on the Lists page in the admin panel. Second, decide on your target sub-list size. A common choice is 25,000 to 50,000 records per list, which keeps each segment well under the 100,000-lead limit that gates bulk management operations and makes each list manageable for reporting. There is no strict requirement on target size; pick what fits your team's workflow.

Step by step

1. Open the List Split utility from the admin panel. It is located in the same section as the other lead management tools.
2. Select the source list from the list picker. This is the list you want to divide.
3. Enter the target size — the maximum number of leads each new sub-list should contain.
4. Submit the form. VICIdial will create the new lists and distribute the leads from the source list into them.
5. Verify the result. Go to the Lists page and confirm the new list IDs were created. Check the lead count on each new list. The total across all new lists should equal the number of records that were in the source list.
6. Assign the new lists to campaigns as needed. Each list can be added to a Campaign's List mix independently.

flowchart LR
  A[Open List Split] --> B[Select source list]
  B --> C[Enter target size per list]
  C --> D[Submit]
  D --> E[New lists created with new IDs]
  E --> F[Verify counts on Lists page]
  F --> G{Counts correct?}
  G -->|Yes| H[Assign lists to campaigns]
  G -->|No| I[Investigate — check source list count before split]

What to check after the split

The most important verification step is the count check. Add up the lead counts shown on each new list and compare that total to the source list's count before you ran the split. If there is a discrepancy, do not activate the new lists until you understand where it came from. In practice, the numbers should match exactly — every Lead moves into a new list and none are created or lost.

Also note that the source list may still exist after the split, depending on whether all records divided evenly. If the source list shows leads remaining, those are the overflow records that did not fill a complete sub-list. You can either leave them in the source list and activate it alongside the new ones, or repeat the split process on that remainder if you want uniformly sized lists.

Also think through whether the sub-lists need different Filter or List order settings from the source list. Each new list starts with the system defaults for those fields, not a copy of the source list's configuration. If your source list had custom settings, check each sub-list and update as needed before activating them in a campaign.

Once your lists are split and verified, you can run bulk status updates or bulk moves on each sub-list separately using the Basic or Advanced Lead Management Tools. For the concept behind why splitting is useful, see what the List Split utility does. For the full overview of all bulk admin tools, read our VICIdial admin bulk tools guide.

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