Decode and encode 4G LTE E-UTRAN Cell Identifier (ECI). Extract eNB-ID and Cell ID from ECI, or build ECI from eNB-ID components.
ECI is a 28-bit number. The upper 20 bits identify the eNodeB, the lower 8 bits identify the cell within that eNodeB (max 256 cells per eNB). ECGI = PLMN-ID + ECI.
ECI → eNB-ID + Cell ID
eNB-ID (decimal, 20-bit)
eNB-ID (hex)
Cell ID (decimal, 8-bit)
Cell ID (hex)
ECI (hex, 7 digits)
ECI (binary, 28 bits)
ECGI Builder
Enter MCC and MNC above to build ECGI
Format: MCC-MNC-[ECI hex]
eNB-ID + Cell ID → ECI
ECI (decimal)
ECI (hex, 7 digits)
ECI (binary, 28 bits)
eNB-ID (hex)
Cell ID (hex)
ECGI Builder
Enter MCC and MNC above to build ECGI
Format: MCC-MNC-[ECI hex]
Frequently Asked Questions
What is the LTE ECI (E-UTRAN Cell Identifier)?
ECI (E-UTRAN Cell Identifier) is a 28-bit number used in 4G LTE to uniquely identify a cell within a PLMN. It is split into a 20-bit eNB-ID (identifying the eNodeB base station) and an 8-bit Cell ID (identifying the cell within the eNB). ECI values range from 0 to 268,435,455 (2^28 - 1). The formula is: ECI = eNB-ID × 256 + Cell ID.
What is the difference between ECI, ECGI, and PCI?
ECI (E-UTRAN Cell Identifier) is a 28-bit logical cell identifier within a PLMN. ECGI (E-UTRAN Cell Global Identifier) is the globally unique identifier formed by combining the PLMN-ID (MCC+MNC) with the ECI — it uniquely identifies any LTE cell worldwide. PCI (Physical Cell Identity) is a physical layer identifier from 0 to 503 used by UEs during radio-level cell search; it is local and can be reused across different geographic areas.
How do I find my LTE Cell ID?
On Android, apps like Network Cell Info Lite or NETMONSTER can display the ECI and PCI. On iOS, field test mode (dial *3001#12345#*) shows Cell ID and other network parameters. Network operators and drive-test tools (e.g., TEMS, NEMO) log ECI and ECGI as standard fields. The ECI displayed in these tools is the full 28-bit decimal value — use this calculator to split it into eNB-ID and Cell ID components.