A UFN number, short for “uniform file number,” is the unique identifier a court attaches to a case when it’s first filed. The label isn’t standardized across American courts: federal courts call it a docket number, some states call it an index number, others use “uniform case number” or just “case number.” The function is identical everywhere. One number ties every document, hearing, and order in a single case together from filing to final judgment.
What the Number Does
A court handles thousands of active cases at once, and the assigned number is what keeps each one’s paperwork separate. Every motion, order, transcript, and letter gets tagged with it so nothing lands in the wrong file. The federal courts describe a docket as “a log containing the complete history of each case in the form of brief chronological entries summarizing the court proceedings,” and the docket number is what makes that log retrievable.1Library of Congress. Dockets and Court Filings
The number matters outside the courthouse too. Attorneys cite it on every filing. The public uses it to pull records. Opposing parties need it to respond to motions. Without it, a case effectively doesn’t exist in the court’s system.
How to Read a Court Case Number
These numbers aren’t random. They encode information about the case, and once you know the pattern you can read quite a bit from the string itself.
A federal district court docket number usually looks something like 1:21-cv-5678-MW. The “1” identifies the division of the court that received the filing. “21” is the year the case was filed. “cv” marks it as a civil case; criminal cases carry “cr.” “5678” is a sequential number showing it was the 5,678th case filed that year. “MW” represents the assigned judge’s initials.2United States District Court Southern District of New York. What Is a Docket Number?
State courts use their own formats, and they vary widely. Some mirror the federal pattern, embedding the year and case type. Others fold in a county code or court-division identifier. A handful of states have adopted statewide uniform case numbering systems that standardize the format across every county, which makes it easier to track cases that move between courthouses.
Other Names for the Same Thing
Part of what makes “UFN” confusing is that courts across the country use different names for the same identifier. Knowing the synonyms helps when you’re reading documents from an unfamiliar jurisdiction.
- Docket number. The standard term in federal courts. One federal court puts it plainly: “the docket number is the court’s case number or tracking number.”2United States District Court Southern District of New York. What Is a Docket Number?
- Index number. Used in some state court systems for civil cases filed in trial-level courts. The format and conventions can differ by county even within the same state.3New York State Unified Court System. Index Number Formats
- Uniform case number (UCN). A standardized format some states have adopted for consistency across counties. These typically encode county, filing year, case type, and a sequence number into one string.
- Case number. The plain-English catch-all that works everywhere. When you’re unsure what to call it, this is the safe label.
All of them refer to the same thing: a permanent identifier that links every piece of a legal proceeding.
How and When the Number Is Assigned
A case number is generated the moment a new matter is filed. The clerk’s office or the court’s electronic filing system issues it automatically when the initial documents come in. In federal courts, an automated system assigns both the case number and a judge through random selection at the same time.4United States District Court Eastern District of Oklahoma. Case Assignment and Numbering
Once assigned, the number stays with the case permanently. It doesn’t change if the case is transferred to another judge or moved to a different division. On appeal, the appellate court assigns its own separate number, but the original trial court number remains the identifier for the lower court record. Every subsequent filing has to reference the number so the clerk can route it to the right file.
How to Look Up a Case Number
If you know a case exists but don’t have the number, where you search depends on whether it’s a federal or state matter.
Federal Cases
The PACER Case Locator is the main tool for federal court records nationwide. It covers district, bankruptcy, and appellate courts, and you can search by party name if you don’t have the number yet. The system returns matches across every federal court.5PACER. PACER Case Locator
You need a free PACER account to use it. Document access costs $0.10 per page, capped at $3.00 per document. If you spend $30 or less in a quarter, the fees are waived.6PACER. PACER Pricing – How Fees Work New filings generally appear within 24 hours.5PACER. PACER Case Locator
State Cases
Most states run their own online portals for searching court records. Capabilities vary. Some give free public access with no registration; others charge per search or per document. The best starting point is the website of the specific court or county clerk where you think the case was filed. Many states also maintain centralized search tools that cover multiple counties at once.
What Happens If the Number Is Wrong
Filing something with the wrong case number, or no number at all, is one of the most common electronic-filing mistakes, and it causes real problems. Clerks reject the submission and you have to refile. The court won’t extend your filing deadline because of the error, so a small clerical slip can become a missed deadline with serious consequences.7United States Court of Appeals for the Tenth Circuit. I Made a Mistake, Such as Filing in the Wrong Case or Submitting an Incorrect Document – What Should I Do?
Typical errors include opening a new case number when the document belongs to an existing case, or picking the wrong number from a dropdown in the e-filing system. If you catch a mistake after submitting, contact the clerk’s office right away. In federal courts, the clerk can delete the misfiled document and correct the docket, but you still have to refile the document properly through normal procedures.