BankCheck
HomeIBANRouting NumberSort CodeSWIFT/BICGeneratorGuides
Home
IBAN
Routing Number
Sort Code
SWIFT/BIC
Generator
Guides

BankCheck

Validate any bank number instantly. Free and 100% client-side.

Your data never leaves the browser

Formats

IBAN40+ countriesRouting NumberUnited StatesSort CodeUK & IrelandSWIFT/BICWorldwide

Info

IBAN GeneratorTransfer GuidesGlossaryGuidesCompareAlternativesAboutPrivacy PolicyTerms of UseAPI Docs

BankCheck checks whether a number could be valid based on format, length, and checksum rules. It does not verify that an account exists or confirm who it belongs to. Always confirm account details with your bank before making a payment.

© 2026 BankCheck

Nationwide Building Society IBAN Validator

Validate Nationwide Building Society IBANs from United Kingdom 🇬🇧

IBANRouting NumberSort CodeSWIFT/BIC

Try an example

How it works

Nationwide Building Society is a bank in United Kingdom. United Kingdom IBANs include the bank code NAIA (BIC: NAIAGB21XXX). Enter a Nationwide Building Society IBAN above to validate it instantly.

Nationwide Building Society at a Glance

Bank Codes

1

SWIFT/BIC Codes

1

Locations

1

Nationwide Building Society Bank Codes

Bank CodeBICCity
NAIANAIAGB21XXXSwindon

Nationwide Building Society SWIFT/BIC Codes

NAIAGB21SwindonNAIAGB21XXXSwindon

Frequently Asked Questions

What is Nationwide Building Society's BIC/SWIFT code?
Nationwide Building Society in United Kingdom uses the BIC/SWIFT code NAIAGB21XXX. The BIC (Bank Identifier Code) is used for international wire transfers via the SWIFT network.
What is the IBAN format for Nationwide Building Society in United Kingdom?
Nationwide Building Society IBANs in United Kingdom follow the standard United Kingdom IBAN format. The IBAN starts with the country code, followed by 2 check digits, the bank code (NAIA), and the account number. You can validate any Nationwide Building Society IBAN using the validator above.
How do I validate a Nationwide Building Society IBAN?
Enter your Nationwide Building Society IBAN in the validator above. It will check the country code, verify the MOD-97 checksum, validate the bank code against Nationwide Building Society's known codes, and break down each part of the IBAN for you.
Where is Nationwide Building Society located?
Nationwide Building Society operates in United Kingdom with branches in Swindon.
Does Nationwide Building Society support SEPA transfers?
Yes. United Kingdom is part of the Single Euro Payments Area (SEPA), so Nationwide Building Society supports SEPA Credit Transfers and SEPA Direct Debits. SEPA transfers to and from Nationwide Building Society typically settle within one business day and are free or low-cost within the Eurozone.

Nationwide Building Society in Other Formats

Nationwide Building Society Sort CodeNationwide Building Society SWIFT/BIC Code

Other Banks in United Kingdom

NatWest1Barclays2HSBC1Lloyds Bank1HSBC (Midland)1

Back to United Kingdom IBAN or try the universal IBAN validator.