# ACS Update Format **File Type:** Fixed length **Location:** `/dti/exchange/cm`. The file name is specified at runtime. ### ACS Update Format
RecordLengthField
Header1H (Header data begins)
6ACS participant (newspaper) ID
10File creation date (yyyy/mm/dd)
9Total number of subscribers contained in file
9Total number of COAs
9Total number of nixies
8Shipment number on invoice
1File class (1 = 1st class, 2 = Periodicals, 3 = Standard A, 4 = Standard B)
1Media type sent (typically, this will be “9”)
375Filler
COA record12 (COA or nixie data begins)
8Record sequence number
7Participant code
16Key line (subscription ID + check digit)
8Date of move (yyyymmdd)
1Move type (F = Family, I = Individual, B = Business)
1Deliverability code (space = newaddress elements, K = no forward address, G = PO Box closed, C = No delivery at this address, W = Temporary address change)
3USPS site ID
47COA name
1Old address type
28Old urbanization name
60Old address
35Old city-state-ZIP
1New address type
1New urbanization name
60New address
35New city-state-ZIP
66Formatted mail label
2Filler
4Postage due
8Filler
1Notification type (A = Future, B = 1st Class, C = Periodicals, D = Std A, E = Std B, F = Periodical Follow-Up notification)
Nixie record12 (COA or nixie data begins)
8Record sequence number
7Participant code
16Key line (subscription ID + check digit)
7Filler
1Deliverability code (A = Attempted, no known, B = Returned for better address, D = Outside delivery limits, E = In dispute, I = Insufficient address, L = Illegible, N = No such number, Q = Not deliverable as address, R = Refused, S = No such street, U = Unclaimed, V = Vacant, X = No such office)
3USPS site ID
166filler
5Old ZIP
213filler