Japan proxies: IP location and mobile network checks

For web QA through a Japan IP proxy, specify what your application must see: country JP, a required city, or a particular public IP network. Add a mobile-access condition only when the job depends on it. Then evaluate each requirement separately; a list of Japanese carrier brands cannot fill the missing evidence.

This guide helps you turn an offer into a sample decision. It covers IP routing proxies, with a worked mobile-network example. No Japanese proxy endpoint or provider was tested.

Choose the evidence your Japan test needs

Write the application rule before requesting “Tokyo residential” or “Japan mobile.” If the rule only reads country, a city or cellular requirement adds a condition the application does not use. For access-type definitions, see mobile versus residential proxies.

Requirement	Evidence to keep	What cannot replace it
Country JP	Public exit IP, timestamp, selected country classifier and the application's country decision	The seller's Japan label
Tokyo, Osaka or another city	Required city, dated classifier result and available accuracy radius; application decision if it uses that location	A country match or a registered company address
A particular public IP network	Observed exit IP and ASN/network result with lookup source and date	The SIM or retail brand
A particular serving mobile network	Dated access evidence tied to the sample, including serving operator and roaming state where relevant	A coverage map or an ASN alone

JPNIC WHOIS describes allocated or assigned address space and the responsible entities, plus ASN registration information. That is registration evidence. A Japanese registration or Tokyo contact address does not measure the sampled exit's location. JPNIC WHOIS information.

MaxMind says mobile IPs may be used over broad areas and finer location data may be absent. Record missing city data as unverified when city is required; do not silently substitute JP. These are MaxMind's documented limits, not a measured accuracy rate for Japan. MaxMind geolocation accuracy.

Translate Japanese brands into the right request

These operator descriptions change how you count candidate networks. They do not establish proxy inventory, resale permission or the access path of a supplied endpoint.

Names in an offer	What the operator documents	What to request
NTT DOCOMO / ahamo	ahamo's FAQ says it is usable in DOCOMO 4G/5G service areas. ahamo coverage FAQ	Do not count the two labels as evidence of two different mobile networks. Specify the layer you need to differ.
au / UQ mobile	KDDI says UQ mobile uses the same communication network as au. KDDI's UQ description	An au/UQ pair cannot establish different serving operators from its brand names.
SoftBank / Y!mobile	Y!mobile describes using the same network as SoftBank. Y!mobile network description	Request evidence of the actual access and egress; changing these labels does not establish network diversity.
Rakuten Mobile	KDDI describes supplemental au LTE roaming for Rakuten and a progressively shrinking roaming area. KDDI's current roaming information	Specify whether the sample must use Rakuten's own network or whether partner access is acceptable.

The Rakuten distinction needs a date. KDDI's page showed a 30 September 2026 area update when checked on 6 October 2026, and cautions that its calculated map can differ from actual radio conditions. A Rakuten label or coverage screenshot therefore leaves the sample's serving network unverified. Agree in advance which device or modem record you will accept and how it will be tied to the sampled exit and time. KDDI's scope and map limitations.

Keep public egress separate. An autonomous system describes IP routing policy; it is not a measurement of the serving radio network. Consequently, au partner access does not tell you which ASN your destination will observe. Record that result independently. RFC 1930, section 3.

Worked decision: three brands, how many usable paths?

Hypothetical example: every sample and result below is invented. A QA team needs two different serving mobile operators. Each sample must also return JP in the application's selected classifier and retain its own exit address at minutes 0, 5 and 10. There is no city requirement. This is an illustrative schedule, not a universal sample size.

Fictional evidence	Sample A	Sample B	Sample C
Seller's label	au	UQ mobile	Rakuten Mobile
Application country result	JP at 3/3 attempts	JP at 3/3 attempts	JP at 3/3 attempts
Exit within the sample	Unchanged at all three checks	Unchanged at all three checks	Unchanged at all three checks
Timestamped serving-network evidence tied to the exit	au at all three checks	au at all three checks	Missing

The country and recorded-address conditions match for each sample. A+B fails the different-serving-operator condition: both records identify au. A+C remains unverified: the Rakuten label does not fill C's missing access evidence. Passing country checks cannot cancel that gap.

The next evidence changes the purchase decision:

• C is confirmed on au partner access at all three checks: A+C still fails the different-serving-operator condition.
• C is confirmed on Rakuten's own network at all three checks: A+C matches the stated operator condition for those checkpoints. The team can accept that bounded record if all other agreed requirements also match.
• C has only a brand label or coverage map: keep the condition unverified and request a sample with the necessary access evidence.

This narrower result does not establish separate towers, backhaul or failure independence, nor continuous state between checks. If those are required, define and obtain evidence for them too. If the job instead requires different egress ASNs, this record cannot answer it: it contains no ASN observations. If the job only needs JP, the carrier comparison is unnecessary.

Run and record the agreed sample

The following is a proposed procedure for your authorized endpoint and test destination; it was not executed for this guide.

1. Freeze the brief. Record required country/city/network fields, client version, protocol, IP family, request budget, session checkpoints and reconnect rule. Agree the source and format of access evidence and how each record will be linked to a sample. Have the provider define any “mobile,” “residential” or “sticky” claim that matters to the brief. Use the curl proxy setup guide for connection configuration.
2. Hold application inputs constant. Keep the destination, account/cookies, language and other relevant settings fixed while comparing exits. Use the destination's trusted record of the public client IP. Preserve the seller's declarations in separate fields.
3. Save every attempt. Record time, exit IP, required classifier values and source/version, application output, errors and applicable access-evidence reference. Recheck required evidence after an address change or reconnect. Retain failures and any retry history in the denominator.
4. Decide per condition. A contradictory observed value is a mismatch. Missing required evidence is unverified. Accept the sample only when every required condition has matching evidence. Report the checkpoint count and observed window; address continuity at checkpoints does not prove exclusive use or future stability.

For session terms, use rotating versus sticky proxies. Take unresolved conditions back to the provider as exact requests: for example, “Rakuten own-network access tied to each recorded sample,” rather than “another Japanese carrier.”

For a separate application check after obtaining a page, see Japanese price parsing. Its offline example preserves yen currency evidence and tax labels; an IP-location result alone does not validate a price record.

Method and access

ipvolt prepared this guide with agent-assisted source research and synthesis on 6 October 2026. Its original contribution is the brand/access/egress decision and hypothetical worked case. It measured no Japan endpoint, supply, speed or success rate. The full evaluation method is available without signup.

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