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Our database confirms that +81 5991 is assigned to Japan.
Known carrier for +81 5991: "NTT".
Geolocation for this prefix: (36.5748441, 139.2394179).
Partial number searches match area-code pages like this — helpful if only the start of a number is known.
Country: 🇯🇵 JP
Country Code: +81
Carrier: NTT
Prefix: 5991
Location: Japan
Coords: 36.5748441, 139.2394179
Area Code Page: +81 5991
Comments: Disabled for area-code pages
Example: +81 5991 *** ***
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+81 5991 is an area code/prefix that appears to be associated with Japan. It may be assigned to multiple phone numbers within that region.
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Carrier information for this prefix: NTT. In some cases multiple carriers may use similar prefixes.
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