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Japan Technology

Japan Post Launches 'Digital Address' System (japantimes.co.jp) 41

Japan Post has launched a "digital address" system that links seven-digit combinations of numbers and letters to physical addresses. From a report: Under the system, users can input these seven-digit codes on online shopping websites, and their addresses will automatically appear on the sites.

People can obtain digital addresses by registering with Japan Post's Yu ID membership service. Their digital addresses will not change even if their physical addresses change. Their new addresses will be linked to the codes if they submit notices of address changes.

Japan Post Launches 'Digital Address' System

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  • by allo ( 1728082 ) on Wednesday May 28, 2025 @12:52PM (#65411131)

    One would think IT people hate systems that convert between numbers and names enough not to invent yet another.

    • by AmiMoJo ( 196126 )

      It makes a lot of sense since typically you want to send a package to an individual, not an address.

      People are moving around more as housing gets less affordable and they are forced to rent forever.

    • Bro, look we'll take your legacy system and greenfield the fuck outta it. It'll be like DNS but 2.0 bro. 2.0!! Like just trust me bro, we'll kill it. It'll be so good that the whole world will collectively go like "why didn't we think of this before"

      That's what I imagine most of those meetings are like and why people keep re-inventing the wheel.
    • by mjwx ( 966435 )

      One would think IT people hate systems that convert between numbers and names enough not to invent yet another.

      We have 117 systems to identify unique addresses... OK, now we have 118 systems to identify unique addresses.

      This is just like What Three Words and dozens of other solutions looking for a problem. The problem with the solutions is that they're not immediately obvious when you need them. Say you want to tell the emergency services exactly where a road traffic accident is? You could use What Three Words as the UKs emergency response number (999) does but chances of you having that app on your phone and ava

  • Postcodes anyone?

    • by EvilSS ( 557649 )
      Not sure about you but where I live my postcode doesn't reference back to my, and only my, specific mailing address. AFAIK only Ireland does that. It also doesn't follow me when I move away.
      • It's more than Ireland. The UK, and the Netherlands typically identify individual streets or in some cases individual houses. Where I live for example our postcode is unique to the 10 houses on our side of the street. The other side has a different post code. Our street itself (which isn't very long) has about 7 different post codes. Add the house number and you don't need to know the state, city, or street name to send mail.

        • by EvilSS ( 557649 )
          10 != 1 I'm afraid. Unless they do it for EVERY home then it's at best coincidental. Also if you move across the country do you keep the same postcode?
          • The Dutch postcode consists of 4 numbers and 2 letters, and with the house number it's a unique code that's equivalent and, for the postal system, interchangeable with the family name, street name plus house number, city. I know people who've send post cards to "Mother Goose, 1234 AB #1", and the card got delivered without problem. So 1=1.
            • by EvilSS ( 557649 )
              "with the house number it's a unique" so in other words, no, the POST CODE is not unique to the address, and more important for the subject at hand, it's not tied to a specific person.
      • It's ok. UPRN is there for minutiae.

      • by Hadlock ( 143607 )

        US Post code + route number is pretty adequate with human mail carriers. I see my postman IRL probably 2-3x a month and he knows who I am, if you send a letter to my post code + route number with the name smudged illegibly it will almost certainly get delivered to the correct house. Not all mail carriers are as social as mine though.

        • by EvilSS ( 557649 )
          Yea but if they ONLY put that on the envelope, will it get to your house? And if you move to a different state, do you keep the same number?
      • by tragedy ( 27079 )

        In the US, the traditional postal code is a 5 digit scheme, which obviously allows for 100K locations, so clearly can't identify an individual address. However, back in 1983, they introduced the zip+4 scheme, which allows for a billion locations. That actually allows for uniquely identifying every address in the US in theory. In practice, there probably should have been at least one more digit for longevity. Also, since the zip code mappings are regional, it does not properly account for demographic growth.

        • by EvilSS ( 557649 )
          Except it is not used to tie a single post code to a single address. If that happens sometimes it is coincidental. Also if you move to a different state, does it change or stay the same? If it changes, then it's really not a valid comparison.
          • by tragedy ( 27079 )

            Except it is not used to tie a single post code to a single address.

            Sorry, do you mean the new Japanese code, or the zip+4? If you mean the Japanese code then that is more or less correct. It does tie to a single address, but it does so serially, following the account holder. If you mean the zip+4, I thought I was pretty clear that segmentation/mapping issues mean that it can't practically be used to tie to a single address even though it technically has the address space to do so. That's why I made the distinction between theory and practice and then clarified. That being

            • by EvilSS ( 557649 )
              The Japanese code, you know, the the thing we are talking about here. Did you seriously lose the plot already?
              • by tragedy ( 27079 )

                I was trying to find some way to give you the benefit of the doubt. Frankly, your post didn't make a lot of sense either way, considering what I actually wrote. I suppose there's no choice but to conclude that you have abysmal reading comprehension skills.

    • Postcodes anyone?

      It's more like a Social Security number that maps to your current address by design.

      • Right am I the only one freaking out about privacy, and harassment? Like can I change the code regularly? It would also be possible for this to include an email system. This could cut down on a lot of waste and eliminate fax machines. Same issue here though I would give up privacy.
  • What Three Words? (Score:2, Interesting)

    by spudnic ( 32107 )

    I wish what3words would have taken off. It's a great way to communicate your location using common words that are easy to pronounce and understand.

  • Address Privacy (Score:4, Interesting)

    by RegistrationIsDumb83 ( 6517138 ) on Wednesday May 28, 2025 @02:01PM (#65411351)
    If you took away the ability for the public to resolve the numbers to a location, you'd have a good system for keeping your address private even when buying items online. Given corpos propensity to sell/leak data, I'd love such a system.
    • by AmiMoJo ( 196126 )

      Japan has another issue, which is that most streets are unnamed and most buildings don't have numbers. Addresses are usually a postal cost specifying the block, and then a description of which building to deliver to. Some buildings have names, most residences have the name of the occupying family on a plaque at the front.

      The residential situation isn't ideal. As well as being a privacy issue, it can be a pain when people with different surnames live in the same house, and when people move around a lot.

  • Yes, our very own Slashdot established the norm, and yes, it was called UID.

    Years later, the Japanese code ided it was a terrific idea, so they adopted it, but they couldn't pick a name, and lazily decided there was nothing wrong with calling it yu id

  • So there will now be a system, which lets companies forever track your physical location? They get a seven-digit code that they can then keep updating to get your address even after you move? Is there something in place to stop them from selling this information? Can I generate a new code if I want? We all know various companies will leak this information, and it takes just one. Will stalkers use this to continually track people? What they need a seven-digit code which never gets resolved to an address (t
  • Seven digits is not nearly enough for world wide adoption of this system.

    There are 8 Billion people in the word right now. So, 8 billion people / 9,999,999 addresses = ~800 people per address. Then we should expect there to be roughly 800 people living in each household? I didn't think they even made apartments that big.

    • If you read the summary (I know that's asking a lot on Slashdot), this system includes letters and numbers

    • Zip plus 4 already does this. I'm not sure if it covers individual apartments though.

      Anyway that's 9 digits.

  • Okay, but why? Some address in Japan are quite convoluted to our way of doing things. For example my in laws’ family name is in effect the house’s street number. If they sold their house and moved the new owners name would become the new street address. They don’t live in a remove village or anything. They live in metro area of about 10 million people about a mile and a half from a rail station where it’s a 15 minute ride to downtown Nagoya. I don’t see how this really solves
  • This sounds perfect.
    I can convince someone at a mobile operator to simswap a victim, then use that phone to update the address, then have the bank send a new credit card to the existing "address"

    • If you can convince a mobile operator to simswap a victim, you can equally convince a postal worker to just give you the mail.
      • That requires interacting with someone physically at the victims address. This would allow everything to be done remotely.

  • ...still be able to harass you wherever you reside in Japan too? Asking for a friend btw.

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