ASEAN + APAC Phone Number Validator

About ASEAN + APAC phone number formats

ASEAN has had eleven members since Timor-Leste joined at the 47th ASEAN Summit on 26 October 2025 (Government of Timor-Leste), and each runs its own numbering plan. This validator covers all eleven, plus Hong Kong, Taiwan and mainland China. Singapore, Malaysia, Indonesia, Thailand and Vietnam were checked against the regulator's current plan, and the Philippines in part. Brunei, Laos, Myanmar and Timor-Leste were checked against their filings with the ITU, some of them old: Timor-Leste's dates from 2013. Not every plan could be verified. Cambodia's last ITU filing dates from 2009 and its regulator's current list could not be read, so for Cambodia, and for Hong Kong, Taiwan and mainland China, the verdict is Google's metadata alone. The result says which applies.

How many digits after the country code

Every count here is after the country code, without the trunk 0. Singapore subscriber numbers have eight digits and no trunk prefix, per IMDA's National Numbering Plan (its 1800 freephone numbers are longer). Brunei's have seven. Timor-Leste's, as filed with the ITU in 2013, have seven for fixed lines and eight for mobiles. Malaysian mobiles have 9 or 10 digits after +60 and landlines 8 or 9, per MCMC's Numbering and Electronic Addressing Plan. Thai mobiles and VoIP numbers have 9 and fixed lines 8. Vietnamese mobiles have 9 and landlines 10. Indonesia's 2018 plan sets landlines at 10 digits after +62, or 11 in areas it calls critical; Google's metadata, and so this tool, still accepts some 9-digit ones, which the plan does not define. The same plan leaves mobile length to each operator, within the 13-digit national limit, and this tool follows Google's metadata for the lengths in use.

Prefixes, and what they no longer tell you

Singapore mobiles start with 8 or 9 and fixed lines with 6; IMDA reserves 3 for IP telephony and data-only services. Malaysian mobiles start with 01, which becomes 1 after +60; when MCMC opened 011 in 2010 it gave that range eight more digits instead of seven, while the existing prefixes kept seven. Malaysia's 1300 and 1800 numbers are toll-free and freephone, though they are as long as a mobile. Thai mobiles start with 8 or 9, and NBTC lists 060 and 089 as VoIP; 061 to 069 are mobile in Google's metadata but have no row in NBTC's table. Vietnamese mobiles start with 3, 5, 7, 8 or 9, after the conversion of 11-digit numbers (counting the 0) that began on 15 September 2018; landline area codes had already changed in 2017. When Vietnam merged its provinces on 1 July 2025, the merged provinces kept their former area codes side by side until the Ministry of Science and Technology says otherwise (guidance 2784/BKHCN-CVT, reported by Nhân Dân); no further notice had been found by 2 October 2026, so the old codes still validate. And since mobile number portability, the prefix no longer reliably names the network.

Thailand's fixed lines still have eight digits after +66. The change to ten, counting the 0, was postponed in 2020, and in 2024 NBTC made it wait until numbers run short.

That is from NBTC's own notices to the International Telecommunication Union, dated 28 February 2020 and 8 May 2024: Thailand's numbering plan communications. So the eight-digit plan NBTC filed in 2020 is still the one in force, and a validator built on the announced change would reject every Thai landline.

What we measured

We built 69 test numbers, each with a verdict that follows from a quoted clause in a regulator's plan. The hand-written rules this page used before 2 October 2026 agreed on 36 of them. They covered only six of the eleven members, and within those they rejected every landline in southern Thailand (073 to 077) and in Indonesia's Maluku–Papua numbering region, rejected a Singapore number typed locally if it began with 65, and accepted Manila's retired seven-digit numbers. The current version agrees on all 69, and the test runs on every build.

Format check vs authenticity check

Format validation tells you whether a number could exist under its numbering plan. It does not tell you whether the number is currently assigned, active, or routable, and this tool does not try to find out. For a form, store the number in E.164, the form shown in the result: + and the country code, then the number with any trunk 0 removed.