🇯🇵 Japan
Registry and organization country assignments can differ from the physical location of an IP. Snapshot: 2026-10-04.
188,701,760
Delegated IPv4 address slots
1,292
Registered ASNs
29
Hosting ASNs
7,422
Known VPN exit prefixes
Country reference
- ISO code
- JP
- Continent
- Asia
- Capital
- Tokyo
- Currency
- JPY
- Calling code
- 81
- EU member
- No
- Delegated IPv6 address slots
- 810,064,904,606,379,904,005,374,266,572,800
Registry allocations
Allocated and assigned RIR prefixes; address slots are summed across records and may overlap.
| Registry | Prefixes | IPv4 slots | IPv6 slots |
|---|---|---|---|
| APNIC | 5,504 | 188,584,192 | 804,809,847,930,687,645,123,798,309,535,744 |
| ARIN | 38 | 85,248 | 184,453,065,853,521,660,959,969,509,376 |
| RIPE_NCC | 40 | 32,320 | 5,070,603,609,838,737,220,615,987,527,680 |
Major autonomous systems
Showing up to 200 of 1,292 ASNs assigned to this country, ranked by announced IPv4 prefix address slots. Overlapping announcements count separately.
| ASN | Organization | Category | IPv4 slots | IPv6 prefixes |
|---|---|---|---|---|
| AS17676 | SoftBank Mobile Corp. | isp | 56,094,464 | 3 |
| AS4713 | NTT DOCOMO BUSINESS, Inc. | business | 28,696,832 | 6 |
| AS2516 | KDDI CORPORATION | business | 18,154,752 | 9 |
| AS9824 | JCOM Co., Ltd. | business | 10,643,456 | 62 |
| AS2907 | Research Organization of Information and Systems, National Institute of Informatics | education | 9,028,452 | 2 |
| AS17506 | UCOM Corp. | business | 5,508,096 | 1 |
| AS2497 | Internet Initiative Japan Inc. | business | 4,221,952 | 11 |
| AS2527 | Sony Network Communications Inc. | isp | 3,867,648 | 2 |
| AS2518 | BIGLOBE Inc. | business | 3,670,528 | 2 |
| AS17511 | OPTAGE Inc. | business | 2,998,784 | 2 |
| AS9605 | NTT DOCOMO, INC. | business | 2,724,096 | 335 |
| AS2514 | NTT PC Communications, Inc. | isp | 2,637,056 | 4 |
| AS9617 | JCOM Co., Ltd. | business | 2,326,528 | 33 |
| AS10013 | FreeBit Co.,Ltd. | business | 1,953,536 | 3 |
| AS4725 | SoftBank Corp. | business | 1,934,592 | 1 |
| AS4694 | IDC Frontier Inc. | hosting | 1,920,512 | 5 |
| AS10010 | TOKAI Communications Corporation | isp | 1,640,192 | 7 |
| AS9595 | NTT-ME Corporation | business | 1,628,416 | 4 |
| AS2510 | FUJITSU LIMITED | business | 1,591,552 | 1 |
| AS18126 | Chubu Telecommunications Co.,Inc. | isp | 1,509,120 | 2 |
| AS2519 | ARTERIA Networks Corporation | business | 1,494,784 | 2 |
| AS4685 | Asahi Net | business | 1,277,952 | 2 |
| AS4721 | JCOM Co., Ltd. | business | 1,263,616 | 1 |
| AS7687 | TOYOTA SYSTEMS CORPORATION | business | 923,904 | 0 |
| AS18081 | Kintetsu Cable Network Co., Ltd. | isp | 868,352 | 1 |
Largest cities by reference population
GeoNames reference data; this is not a count of located IP addresses.
- Tokyo · 9,733,276
- Yokohama · 3,777,491
- Osaka · 2,753,862
- Nagoya · 2,332,176
- Sapporo · 1,973,832
- Fukuoka · 1,612,392
- Kawasaki · 1,538,262
- Kobe · 1,525,152
- Kyoto · 1,463,723
- Saitama · 1,324,854
Hosting counts use ASN organization classifications. VPN counts include distinct exit prefixes with a source-provided country seen within seven days of this snapshot; zero means no known evidence, not absence. Country and city references: GeoNames (CC BY 4.0).