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FIRMS code

U231 EQUISTAR OD 3, 4, 7 & 11

Deleted Foreign trade zone

This code is deleted in CBP's FIRMS list. Don't use it on new filings. FIRMSapi keeps deleted codes so lookups of old paperwork still resolve; check the port listing for a replacement.

Facility details

FIRMS code
U231
Name
EQUISTAR OD 3, 4, 7 & 11
Address
CANTWELL LANE
CORPUS CHRISTI, TX 78401
Status
Deleted (D)
Facility type
Foreign trade zone (02)
CBP port
Corpus Christi, TX (5312)
CBP region
6
Last changed
2026-10-23
Data as of
2026-10-23

Pre-filing validation

Validate U231 before you file

Validation fails U231: it's deleted, the reject ACE returns as 159. Search the port for an active replacement. 

curl https://api.firmsapi.com/v1/validate \
  -H "x-api-key: $FIRMSAPI_KEY" -H "content-type: application/json" \
  -d '{"code":"U231","port":"5312","use":"ftz_admission"}'
Get a free key Validation guide

Source: U.S. Customs and Border Protection FIRMS code list, data as of 2026-10-23. FIRMSapi is not affiliated with CBP; confirm bond status and filing details in ACE.