The modern toll road system in Russia is based on automatic toll collection technology, and the key element of this scheme is transponder. This is a compact device that is mounted on the windshield of a car and allows you to pass checkpoints without stopping, automatically debiting funds from the owner’s personal account. However, to fully manage services, link to a car, or contact support, you often need to know the unique device identification number.
Many drivers are faced with a situation where they urgently need to find this code: to register in an application, check their balance, or set up automatic replenishment. Where exactly to look for this information? There may be several options, and they depend on whether the device is in your hands, or you plan to find data remotely through Internet services.
In this article we will look in detail at all the possible ways to identify your device for different operators, including Avtodor, Mainline and other systems. You will learn how to decipher the markings on the case, where to find the number in your personal account, and what to do if physical access to the transponder is currently impossible.
Location of the number on the device body
The fastest and most reliable way to find out the identification code is to physically inspect the device itself. Almost all manufacturers apply unique markings directly to the transponder body. Typically this data is located on the back of the device, which is glued to the glass, or on the side. In order to see the inscription, it is often necessary to carefully remove the device from the mount or, in some cases, remove it from the glass if it is secured with double-sided tape.
The required combination of numbers can be signed as Device ID, Transponder ID or simply “Device number”. It is important not to confuse this number with the serial lot number or model code. On devices of different operators, the recording format may differ: in some places it is a purely digital sequence, and in others the letters and numbers are mixed. For example, on system transponders T-Pass the number often begins with a prefix indicating the type of device.
If the sticker with the number is erased or damaged, try shining a flashlight on the body at an acute angle - sometimes the engraving remains legible even if the print is faded. Also pay attention to the packaging of the device, if it is preserved: the serial number of the transponder is always duplicated on the box or in the warranty card.
⚠️ Attention: Be extremely careful when attempting to remove the transponder from the windshield. Many devices have an adhesive backing, which, if sharply torn off, can damage the internal antenna or battery, which will lead to failure of the gadget.
If you plan to frequently remove the transponder to swap between cars, use special removable suction cup mounts, sold separately, to avoid damaging the adhesive layer of the main device.
Search for an ID in your personal account and applications
If physical access to the device is limited (for example, it is already installed on the car, and removing it is inconvenient), the simplest solution is to check the operator’s digital services. All major toll road service providers provide users with access to personal account on the official website or through the mobile application. When registering a device for the first time in the system, its number is automatically linked to your account.
To obtain information, you must log in to the system using the phone number for which the contract was registered. In the “My Devices”, “Transponders” or “Profile” section, a list of all linked gadgets is displayed. It usually contains the full device number, its status (active/blocked) and personal account balance. Application Interfaces Avtodor, 15-20 and other operators have a similar structure, which makes navigation easier.
In some cases, if you have just purchased a device and have not yet activated it, the number may be indicated in an SMS message received immediately after purchase or delivery order. Also check your email if the order was placed online - the order confirmation always contains unique code activation and device number.
Instructions for T-Pass transponders (Avtodor)
Devices released by the company Avtodor and working under the brand T-Pass, are one of the most common on the M-4 Don, M-11 Neva and M-12 Vostok highways. For owners of these transponders there is a clear algorithm for searching for a number. On the back of the device, on a white sticker, there is a barcode and a series of numbers. It is this combination following the inscription “No.” or "ID", and is the number you are looking for.
In the T-Pass mobile application or on the website avtodor-tr.ru Device information is located in the user profile. If you own several transponders, the system allows you to switch between them, displaying details for each. It is important to note that for devices of different generations (for example, 4G and earlier versions) the location of the information may differ slightly, but the principle remains the same.
To ensure correct operation of the system and avoid errors when paying, it is recommended to periodically check the number specified in the application with the number on the case. This is especially true if you used a device replacement service or received a transponder through a loyalty program.
Sequence of actions in the T-Pass application:1. Open the "Profile" menu.
2. Select the “My transponders” section.
3. Click on the device image to view details.
4. Copy the number from the “Identifier” field.
☑️ Checking T-Pass transponder status
Features of Mainline device identification (15-20)
System transponders Mainline, operating in the western direction (highways M-1 "Belarus", M-3 "Ukraine", Central Ring Road) also have their own marking features. On the device body 15-20 The number is most often located on the end or under a removable cover if the design assumes the presence of a battery compartment. The digital code can be duplicated on an insert inside the package.
In your personal account on the website 15-20.ru or in the “My Transponder” application, the device is identified by the contract number or the number of the gadget itself. When logging in, the user sees the account status and associated equipment. If you are using a business account, the transponder number will be indicated on the expense itemization or on the assigned vehicle card.
Please remember that transponders Mainline can be issued in partnership with banks (co-brand cards). In this case, the logo of a financial institution may appear on the front side, but the technical number for travel on toll roads remains standard for the system and is located on the back side.
| Operator | Where to look on the case | Designation | Format |
|---|---|---|---|
| T-Pass (Avtodor) | On the back sticker | ID / No. | Digital code (10-12 characters) |
| Mainline (15-20) | At the end or under the cover | Transponder ID | Alphanumeric |
| ZSKAD (St. Petersburg) | On the back | Device ID | Digital code |
| Obninsk (A-108) | On the label on the back | Serial number | Digital code |
There is no universal standard for the location of the number, so always check all edges of the device and documentation if there is no information on the front side.
What to do if the number is unreadable or lost
Situations where the sticker on the transponder fades in the sun, wears out, or the device is lost are not uncommon. If the number is unreadable and access to your personal account is impossible (for example, your password is forgotten or your phone number is lost), the only option is to contact the operator’s support service. To identify you as the owner, you will need to provide the passport data for which the contract was drawn up, and the approximate date of purchase or activation of the device.
The operator may request additional information, such as the license plate number of the vehicle to which the transponder was linked, or details of the last transaction. If the device is completely lost and the number cannot be restored, it is recommended to block the old account to avoid unauthorized debiting of funds (if the transponder is found by others) and register a new one.
If the transponder stops responding to frame signals, but you were able to find the number, try the reboot procedure (if the design allows you to remove the battery for 10 seconds) or contact a service center for diagnostics. Often the problem lies not in the loss of identification, but in the battery discharge.
⚠️ Attention: Never try to open the sealed transponder housing yourself to read the number on the board. This is guaranteed to break the seal and cause electronic failure and will also void the warranty.
Can I use another person's transponder?
Using someone else's transponder is only possible if it is linked to your car in the personal account of the device owner. Driving using someone else's transponder, linked to another car, can lead to fines for unpaid travel, as the system will record a discrepancy between the vehicle class or car number.
Frequently asked questions (FAQ)
Is it possible to find out the transponder number by the car number?
There is no direct way to find out the device number only from the license plate number of the car through open sources for security reasons. However, if you are the owner of a car and are registered in the system, you can find the linked transponder in your personal account in the “Vehicles” section.
Does the number on the receipt match the number on the device?
Not always. When purchasing, the cash receipt may indicate the contract number, product article or internal code of the point of sale. The identification number of the device itself (Device ID) is usually written in the warranty card or on a separate passport tab included in the kit.
What to do if the transponder number is not accepted during registration?
Check that the characters you entered are correct (especially the letters O and the number 0). If the error persists, the device may not yet be activated in the operator's database or may have a "reserved" status. In this case, you must contact technical support.
Does the transponder number change when reissued?
Yes, when you replace a device under warranty or in case of loss, you receive a new physical gadget with a unique number. The old number will be blocked, and to continue using the services you will need to link the new ID to your personal account.