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Number Buffet
ja

最初の 500 個のNano ID

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GmmC2LT-55HQsijWHS529, YlnYe3Sk7KD_gEjpDl2PH, r0WVqCm3-Crxk_CSe91PC, jGZJyT-n2Zllqtpk8iK8x, 5TATOxVFr4-bdJVVQ9hqS, WkZ8QSimqNse3Zvb_Gpb4, UWpsWL-IXs5rVubk0c2Bs, Aj_GjqMZwRJzdfxh-SAJv, YWCeZNiZwHwhFwYjVJS2t, Psx-Lzf43GABoQ9qiaEDS, 8Rp-FeUmt9zQRU9kyQ_rs, aMgOvA8GL3oHZMfQguP2Z, BTBmjco-z4F0TVF9GKI5P, fDbTHM_Hs5sMX5R_w-KaP, 1GwLUoQRb8y0n_0zcDrSl, yqpliCVCdfxeTRCSZW-2E, a4KP7NCnOieiE1_qYQqKL, mTMIzFVLMoOw7jzgoi_10, CI0rpdBxCOHxGlkQX4yOo, h2u_Hj3J4QAAt6522ZDPF, XLTmhHCjKN5RZbMBgbPDX, PohZT8JV9cf8ARkbmFJ1S, gOo0SY8E2aXZBckoG_Ok5, kmGct1aSh2zqGyZXTDygs, ejao5tH0NSK9ST1N_wm2B, Vbsv2auOh3wptJOr8-FlG, W6opJiBZIFTQoo9psEILD

21 characters from the 64-character base64url set (A–Z, a–z, 0–9, - and _) — about 126.0 bits of entropy per ID. Reaching a 1% chance of any two IDs matching takes roughly 10^18 of them. These IDs come from a seeded, non-cryptographic PRNG so that a shared link always renders the same list. The real Nano ID library draws from the platform CSPRNG instead; use it, or crypto.getRandomValues, for anything that has to be unguessable.

設定

クイックプリセット

Nano ID defaults to 21. Each character of the default alphabet adds exactly 6 bits.

Optional. A readable tag like user_ or evt_ makes IDs easier to recognise in logs. It adds no entropy.

Change the seed for a different list. The same seed always gives the same IDs.

見た目を微調整

まず画像の横にあるプリセットを選んでください。ここで細かく調整します。

Frame

A border drawn inside the edge of the image.

詳細設定

結果

500 件の値

qk23B4VVqXlD1eFPNAZPg, BGFN0hUQX-UJMs-ayI9UT, e116sCkyDx0vgc6Jmf4eW, _yt43h3jBOTJh3k7JbaZo, 5o1ogR-6C0AlyY7MO4Ogg, 4RhswGnRLZ-9f6DQyJ4UX, qVP1VqfxNmuQlvkxYz8IO, Huv9HEZHzJav4jKyj1fpH, gk-GUHXmRwXz1flOAb98C, yOHtXGOeiTjjgG7aqn6Am, obilC_E6czDkHkgBcQrI1, 0kndM_5ZPgv_RSsAGQF75, CHr2SOd6Tnxv6KmX9H_Aq, Jd4SMLhWE5J6MIc_EctFl, UCo3VMjlDSLNDT8-zj_x5, Vqh2wFSZAwDn036Txjt9z, lFdffPDQnCDOkFuw8LmKL, 7HrsprP-wszPdvSnzSlWG, oUf8Ecx2S-K0paRk4158_, BK0zb0vOg2bqrTTZjv32d, raaCzH7jFOnyHdvthzpm1, RfxOdshiQUrFEoqC-ZI6y, -E2yEl5L5VNOvDb7wF_Zj, 1iUFdzENLT61jzJI4ANGp, z6iR2Kq0H0Jr3zh2ro90L, tqgpMvmb3IxEnVPd_QGmb, 0W67J-uCEzZ6pNldHR8Rj, Z3jzIak1CEyxeZyoIBxyK, WOJ7-qoA2zXPbe_tjaiV1, ejv-jrQJAlZpW2WfAiirb, d3dxOcGEfGgmMXTXkgx6M, pyEOlo8BS12RSGRe3gcdl, z79eyyMrrHMBB1-3yYxrq, eEitWm6NEFZnvhOT3F2wX, mB_1C8F-q3XL0pzD6jUOX, 5RUQ2XNor8ahFiu9BJg5-, 81nbOAzW888dKToa_V8oN, WAIyfZx9t_3Tyo5s0dkpG, ksBYeu4bgUbN0J8a1oJ6V, s_yMlN_hDqTD3gf7naBG8, MDq9U06U2kQArH-yFyuJj, IR7VDRn6JAr1rARyj-RdL, Ix2O9stpAgtK1BaprdA0T, 8tQfuTVgM05tYxnq6bruB, TbGVlROqsbuXv02dVxBVc, D5Nq7f31Q4RuKlGL_lST2, aYxZGNM3dJ42X_EXamIvI, Wm4RSEkI2Rbyvi5MeIveN, sOF7b2JqQlhNp3xyE0zsN, JipOdLhaVfbAOsv-NNLqw, Vr5gULI5x6uzOmo_SBeCp, 0CoILH2DVykhzT6HfiutY, wDKll_nt5XMn4LKwLxED1, ykkcIC_1Y8vR51fWQasyR, jEqfUUeE7XvJEgYFRh36a, 1WNVRnYvZhlVAD85VnVNr, 15WUz0aPVEW3I41YYemTt, h5wpLtL8c3gg3gA1EbfTB, Z35tLrA5eRLKx_TKeh7S1, vBh3UFQ5ff7WX7GO8MFPX, wEEfg6MZ31Db1CVLnW-C2, I63ERG3mJeaRPcCKV37Wx, nLRwG6D3sW49GelZm-iHz, krEFcrV3goelvVyAvFGm8, GUHS0RCNlwVWJUrba7l1e, TJGmlPlEz03Ci2uhcs02B, qRbdxIqhcbG-JndklaOcF, k9XXD4riQVGFlRfdLMr6R, sqjWdYXK57p3F_QlkBaaS, Y0B4fSpFSj-qevRKGJNK7, ulAy6nc62ISacyYV6LTUA, tXEJ6EqkdoNH6Pqma81uo, LiRWvIHVhs4e7KFGGY9l6, 9MTUKKOVHaMTnwZEREJjx, 90PG2ukLT7DMdjxpg28ro, sJ_qOsElM6e9BLuXxvfPA, 3HbiBbMEAWRU4uCRMaemd, PTKtCNt_El09Rcj_WOg1G, wpCe2ph4I9YvsbFJwuw_k, 7XvGvdz-5oi6evKJNxmpW, cmCofWjUzSEP6E-CYD34f, dNqe0Bfj41nKjAb9n5usE, aHg_-nkjURTrv2OpAHfJz, Gjl5JLEERePWBkbvLKoFe, S8ZMZtjLFxXV6GYzQ_PRH, wD8uu61sHqs_YhqOpSdUb, 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aEyIdNl4xn29hP0Hef1ut, 7XX8kesIWHR7-fMBarVNy, h35V2WvtVknlkC1m1w8qA, XXzw8jbUiyc557QHLnmet, uXGaTj0fsG_48TENecBqR, oM6fKoDvg8dpqWVXKHCJA, gVFViVKvRTLUkUYN5D6zN, 68wyRf5N9NuiszLWY2zBK, JZlmtbzTnw0fQJBaYnFZK, D1-MaflGYL1Xl7Y3OalLf, cv58BiIlcw0uLWRKsEftz, HJlW_ogfD2gcifMXXl3wM, f_FaIzSyHC-Aly8_-REEB, 5jW9weqM6pxV860NaJICj, asWn8IVugQ-tzq8epIB6L, kxQDLa-feqhfNP0XOzqI8, _GJovR1bch8y5AL5MUgaI, mQOCDigZcNFmsISprZADb, bCpkXSRqCVL00E0MC3niU, OhIMTBoN3PSnZalT2bf1-, 9wbPBrrXBrPG_mA5pkKhj, RABGXmmRgY911rj3X2ZQ-, VpXAG1WgRryytrKaiFrjK, alU3-8LNu29XlTl33UyPA, ELriEfCWsu-tspFERhDWy, 05ku-V5NbKwdI_mu0vfqy, D0_7mXhEfmJP_qrG7gHYQ, Ejpf5ae7uoWneeYgsmpMW, Ilp0R-OCxiTJs6QO0y1LJ, s-OLJBQgtfPNHZgGr5Hqv, yEAOWe_tiDReFu9gFB7ZG, kUCpTKr-7nvgLafqjY8FI, K_pMkpQ4VdtnWo5ZjZbNB, lrMhYQoaE0OlTuJl4LcUq, c_WewySwHy4NzSAb4WgZo, nl9IC4wlxZRdjuHyrCScK, YS0J1klu5MocuDDFgtwjC, uXasXoDy7wXVKPlDYx5N4, KlmmJpWrmgqDEi7_kNw9d, eBOo9DGjZCbo1a5UEknM4, R-M23uysFnaPVnDNHm-4E, Eja2pUL2U5ytS_qOgPrcD, VYh2bv19N6p9_smLhr2Gn, 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rTaw5GkYR3NpCFZGjzvP4, KQjzcwD3fAkesIVslmf2n, W0cbSx6lCoisZmDXlkaaV, o1QMfHxeqhWlkNbnarHhR, y0sNEBpKzBb90NlVCT8By, 71ZbmPzs_N91k5fUxmf5_, 9hLa7Eis5Zphle7Xx-TY_, vsGVmDGOvEJoihpLQWRn_, ct0bpmLDbohjhMXq43fd1, cVMd0cR-2dd2trCko64j4, 6NR7yp7TMSNMB4LYmjfha, QcF4sfCpXwdWnBfBVMbKS, K34IX46RGHtjRGm_BEloG, vAlsNeRSHX3EHpSR-yNCp, IZbYc_LyfaOqkqRmWPWy7, KEkOqY-cfuPL8kyMWX2yr, ghn-1PS2XTNaKwgLm56MH, I3Ilpyj9QjJrhGXZOz6B4, sXKEK3ht-9UWnUw5jLXwE, 1iabRrXY85EKNOBA4HWMW, Ow2EU-IpdAbV8qtC-BjZN, bgp29iz5P1zaYKYTnsFEC, iOqWjmYwu-j3hxdDMqPPn, 454tUev3aNCLlO3UtfURw, 4uYJBgRRzrTLSe7vmfbpq, xm4EC3iX188zTJa1IwSE0, Tqnb2KxQ5oDlGaslTqZxI, NjmW1Dv4zNw42_FJOgIPw, wAMsCKCHUnk8d0D3sN70j, 5SOMuXRr-kfL9Z-Q6-G_7, QHo_Oen2FPJk9Q_PoX2zm, SFOEAVcP75vxGUXJraE3l, 1MaLAFXuq_FpVW7os5kVp, ItBKysdB_eV3IH4YblTtH, mujWDYPT8aaIYcq-FPr27, dKl7nH87IISrUbXa0Rb2x, J1XIbMAVpMHQetLTIKnNd, wOWEl2l0x9eTg2pHhc1D5, XqCgCUiIA8jh_WD_B0Fsx, 8alkmAAQFqDQWqMJDxm8i, Uwuux2_Jupco0wxcqFMrz, vBmvaPHxbDu95BFyxUt8b, iqbD0hj8Z6IMbxhYW5iLr, YVnIN-toAYnMshkykQ1RY, lPQrwm8gFTIeF7UjEr4v6, WeXf5E3ArE9f2RLPosEkG, HDbr5y3xIzWeYVLzx6ZFw, 3Bon0TFyNDf0ALI6Ysk-7, X6J48tjJwtrkslUGPOHej, _OEJD1kyR5skoclrlPlXS, KAK5DSG4OCmxeAb9D4Lup, T4X0C8nSc6yXDoevTzg2b, R_LFpaXRY_hgX9P0_Wllu, Yp_CxTNMJjRmyeQLu6-6_, PHKLo-6srmA4Ui02Xv4IX, WFs0VxplnR3T8OIfEl_kW, jHu_-xDtpishRVOC7A4UH, tAtN1FcPfpSorzyLi7Seg, 6lwLaLSs5UNDn2AadSEfw, 4QaXf7v731WdMTIJy-QPl, --gXc9wd5gZQPeIGeYTN_, 7iHp_MFxI5uILCdMAez9P, BQ_yhHeMxfj_Gw_T9E6tG, Dht4YrypGh7b_iyzA4J4T, CPgKxAHuzGSDPYacfFkB0, XN46mLKaIT1ZIqWlF8Ykb, P5LTudzIfrX62zmD0vTRZ, jyGppYzC5Go29YHiMG9tT, e7mrgPwCk4AGDs5eAwwLA, r8b6j_xc5W_uFfHN5WiJd, LFiofU8GR2VzW2pkqcwlS, LHTrkQAHE6sV0RAcO4Z8m, 3Ftml2nrxl8kYh6gDI9qR, SZ9wwkzvaATASboeuK3xe, gWnwOoYuTxiLN5O7KmAU7, mi93bhBM9wA3Zor74MN6B, oSWpnfzdBPzyov2Yuy_q_, 2sJc3k5NX--313-zJm_8_, c80cPy0r5Xjma2oWuELAb, GFn45u3FkXYeQTes4nwl_, IOp5CWoBW5iAJSqT5UR3t, PMFHFuJthlxV_4XwQQkeK, sTQ4RTsHHGn41WDhlhmy4, focqZj_3cnnoJVY9onEqL, wuEJXUg77nlFLx3VKMTsf, lEEjg8VasCf0jYDIPUxWs, x8PlRsV-wzeR9Z1696OBR, MKjWZfO-ZnxMLRpXEj9g7, Ec2_S6jrAqS81FzAsGNOL, 7F9F1h4e-__OmGsWjNOVN, Pnr9704O7pbk1Fr0L7ddw, 5qp36bvsxkUTpjwiKWmjj, WB2kjwtfwxbB6owzl2MB6, 8ih-S928T0b6zZ9HTGpQ8, pN0ERV3eaFB9LZMCI1QPu, IBEMmu9ULyCO08zFqMtZB, DMaDyLqIQnz06WfhFYDMD, yiH130XYgeqyxgFw7dtoL, VO2UVNM8572xXjYRqupL3, QR8HEQiAKeygCI2RaaXNW, ttq6OVyLNCIoM66L6CFum, 8nSO_qnnx_5cgBvOEoKnr, -u7y8mbm_Zzn4bBGa_Pvr, 76KsWH4Dp1XGynlh6M-0l, 1VuDb8GDws6-gxj5_Hor3, ygtkP0UIjfGh1NB8LMNDV, TVNQpo51S2OAkJ0xhHOIs, MsBK2jowQCHx0-bsgBI0j, pYCa6oh-nz_yFW22yqDGs, YXFIJFhBuZtO6JFwLQ712, IXd5edL2ghdONOUV31gNV, PkVaphBluohzNahOHM6bz, 6fID4nc8MTuaCkCEtqPmZ, RsVlCxU-fo9G_v2QKRcWl, B0ctJN9Hbg3-CyLB2Ma5s, cpM0FfC0Yr8E9HRsodoTo, CInsfv-1dYq2DtJp7w7GE, 7v3R1iIP9IH198AAeCOWR, GEwqnhTAT3uzAxnHbvB70, aqrgNIyv6FQdYjOhuxYKa, umBj5WXk13oDDHr873HgE, av-OIeJjjTXJnajxnKLA4, MOtCVpiZmv4ifALsNtoix, WtM39x55vMvRhpb2-d5UY, RyAQBiQVID3pThZ4Z3Bmz, XbCVzT2a0j8nN3hF5OcuA, CwQnlvs442pczlO6M-Kr_, Y-PuAyHR0AqEAQgMJ3axH, qQJz3NqjDGXIbcVihEPMB, GmmC2LT-55HQsijWHS529, YlnYe3Sk7KD_gEjpDl2PH, r0WVqCm3-Crxk_CSe91PC, jGZJyT-n2Zllqtpk8iK8x, 5TATOxVFr4-bdJVVQ9hqS, WkZ8QSimqNse3Zvb_Gpb4, UWpsWL-IXs5rVubk0c2Bs, Aj_GjqMZwRJzdfxh-SAJv, YWCeZNiZwHwhFwYjVJS2t, Psx-Lzf43GABoQ9qiaEDS, 8Rp-FeUmt9zQRU9kyQ_rs, aMgOvA8GL3oHZMfQguP2Z, BTBmjco-z4F0TVF9GKI5P, fDbTHM_Hs5sMX5R_w-KaP, 1GwLUoQRb8y0n_0zcDrSl, yqpliCVCdfxeTRCSZW-2E, a4KP7NCnOieiE1_qYQqKL, mTMIzFVLMoOw7jzgoi_10, CI0rpdBxCOHxGlkQX4yOo, h2u_Hj3J4QAAt6522ZDPF, XLTmhHCjKN5RZbMBgbPDX, PohZT8JV9cf8ARkbmFJ1S, gOo0SY8E2aXZBckoG_Ok5, kmGct1aSh2zqGyZXTDygs, ejao5tH0NSK9ST1N_wm2B, Vbsv2auOh3wptJOr8-FlG, W6opJiBZIFTQoo9psEILD

21 characters from the 64-character base64url set (A–Z, a–z, 0–9, - and _) — about 126.0 bits of entropy per ID. Reaching a 1% chance of any two IDs matching takes roughly 10^18 of them. These IDs come from a seeded, non-cryptographic PRNG so that a shared link always renders the same list. The real Nano ID library draws from the platform CSPRNG instead; use it, or crypto.getRandomValues, for anything that has to be unguessable.

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最初の 500 個のNano IDは何ですか？

最初の 500 個のNano IDは次のとおりです。

qk23B4VVqXlD1eFPNAZPg, BGFN0hUQX-UJMs-ayI9UT, e116sCkyDx0vgc6Jmf4eW, _yt43h3jBOTJh3k7JbaZo, 5o1ogR-6C0AlyY7MO4Ogg, 4RhswGnRLZ-9f6DQyJ4UX, qVP1VqfxNmuQlvkxYz8IO, Huv9HEZHzJav4jKyj1fpH, gk-GUHXmRwXz1flOAb98C, yOHtXGOeiTjjgG7aqn6Am, obilC_E6czDkHkgBcQrI1, 0kndM_5ZPgv_RSsAGQF75, CHr2SOd6Tnxv6KmX9H_Aq, Jd4SMLhWE5J6MIc_EctFl, UCo3VMjlDSLNDT8-zj_x5, Vqh2wFSZAwDn036Txjt9z, lFdffPDQnCDOkFuw8LmKL, 7HrsprP-wszPdvSnzSlWG, oUf8Ecx2S-K0paRk4158_, BK0zb0vOg2bqrTTZjv32d, raaCzH7jFOnyHdvthzpm1, RfxOdshiQUrFEoqC-ZI6y, -E2yEl5L5VNOvDb7wF_Zj, 1iUFdzENLT61jzJI4ANGp, z6iR2Kq0H0Jr3zh2ro90L, tqgpMvmb3IxEnVPd_QGmb, 0W67J-uCEzZ6pNldHR8Rj, Z3jzIak1CEyxeZyoIBxyK, WOJ7-qoA2zXPbe_tjaiV1, ejv-jrQJAlZpW2WfAiirb, d3dxOcGEfGgmMXTXkgx6M, pyEOlo8BS12RSGRe3gcdl, z79eyyMrrHMBB1-3yYxrq, eEitWm6NEFZnvhOT3F2wX, mB_1C8F-q3XL0pzD6jUOX, 5RUQ2XNor8ahFiu9BJg5-, 81nbOAzW888dKToa_V8oN, WAIyfZx9t_3Tyo5s0dkpG, ksBYeu4bgUbN0J8a1oJ6V, s_yMlN_hDqTD3gf7naBG8, MDq9U06U2kQArH-yFyuJj, IR7VDRn6JAr1rARyj-RdL, Ix2O9stpAgtK1BaprdA0T, 8tQfuTVgM05tYxnq6bruB, TbGVlROqsbuXv02dVxBVc, D5Nq7f31Q4RuKlGL_lST2, aYxZGNM3dJ42X_EXamIvI, Wm4RSEkI2Rbyvi5MeIveN, sOF7b2JqQlhNp3xyE0zsN, JipOdLhaVfbAOsv-NNLqw, Vr5gULI5x6uzOmo_SBeCp, 0CoILH2DVykhzT6HfiutY, wDKll_nt5XMn4LKwLxED1, ykkcIC_1Y8vR51fWQasyR, jEqfUUeE7XvJEgYFRh36a, 1WNVRnYvZhlVAD85VnVNr, 15WUz0aPVEW3I41YYemTt, h5wpLtL8c3gg3gA1EbfTB, Z35tLrA5eRLKx_TKeh7S1, vBh3UFQ5ff7WX7GO8MFPX, wEEfg6MZ31Db1CVLnW-C2, I63ERG3mJeaRPcCKV37Wx, nLRwG6D3sW49GelZm-iHz, krEFcrV3goelvVyAvFGm8, GUHS0RCNlwVWJUrba7l1e, TJGmlPlEz03Ci2uhcs02B, qRbdxIqhcbG-JndklaOcF, k9XXD4riQVGFlRfdLMr6R, sqjWdYXK57p3F_QlkBaaS, Y0B4fSpFSj-qevRKGJNK7, ulAy6nc62ISacyYV6LTUA, tXEJ6EqkdoNH6Pqma81uo, LiRWvIHVhs4e7KFGGY9l6, 9MTUKKOVHaMTnwZEREJjx, 90PG2ukLT7DMdjxpg28ro, sJ_qOsElM6e9BLuXxvfPA, 3HbiBbMEAWRU4uCRMaemd, PTKtCNt_El09Rcj_WOg1G, wpCe2ph4I9YvsbFJwuw_k, 7XvGvdz-5oi6evKJNxmpW, cmCofWjUzSEP6E-CYD34f, dNqe0Bfj41nKjAb9n5usE, aHg_-nkjURTrv2OpAHfJz, Gjl5JLEERePWBkbvLKoFe, S8ZMZtjLFxXV6GYzQ_PRH, wD8uu61sHqs_YhqOpSdUb, 6-kRHTuEkCksdpJ5t0iqZ, dpEmWTWASl5-fHLYJWn1I, Gl3NSgfEkl9PP-uKAPAz1, mBY5V1wqir-aE6RAcMRl8, EQgWUPd-GUTS24n8dy6xd, a-05Of-OPMeK4ib5Op2zP, dlMaJR2vw2Z-LsYCslOxa, OhwemUYJREV_KACDxXR_J, 3VU75RZeIWOkmfsA4KLcI, acj2Mi8GINPJNXy4IiGQf, oS8-0mMw_jcInE7ClYvmL, A3QfZoKF3TIGZciPoGT-D, pHHLSqGd0SnMdQw64xa3I, S5SINELrMgyLOX2EYDOP5, qw-L72DFUSPPha9GErKQD, 1hg3kHTB4PU9YcHZznrv3, qB7XyIXMPYeYYs4sEm3nW, 4bXg3OwAAgKdfhaRPHobx, Dr2yX9BXl8LzjYPzP-qvv, T2kp3coY86v4_txDZJbBS, uEtGvJTskhkHsPnI43_DM, O2xYf_DjQyMTxRD76fdtW, fdvhdmiDPwsFcQE3Qxq2X, QdcrIcDwDhAK-R9UsqB0p, UMh6Xn5krr6zpmBskE-zB, IaBieLOjaDECx98wNs9Y6, lHpxq1XF0Pr2miREttkEg, iyx5b_yXITyCDQ8oumniK, JDMGFcYZXiwclfi6JXVwT, U82uLA5cHeWQEVkasxcaC, WfSRrMSvJYx-KqMSgSAy_, Z1k9TJUOHbaw5smG7Pe3f, cx_5w8yjLbTWVNw8TnuQ9, yzSoky4ACuanSKyU85p2U, 4vfwdRoGIbAIAelqVX_-N, vwmtEsIe0eIZCm7ujB2n6, H1JFg-m1-EFG1l6mKZyJ3, VQ81JJE7sO3fEIQV59T1K, lYr-BDDuyy62I4aqkyMa5, w3udfM7NMX8GsYPqrVfNv, 4EhngyUymZ8Ck5vzHiLJA, J6srRDMmjheePUGVs9XQb, bj6ckMr8KNvQgKCn1LClg, 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以下の解説記事はまだ翻訳されておらず、英語で表示されます。

Nano IDについて

Nano ID is a reaction to two things about UUIDs: how long they are, and how badly they fit in a URL. The canonical form is 36 characters, four of them hyphens, and the remaining 32 are drawn from an alphabet of only sixteen — hexadecimal is a wasteful way to carry randomness. The alternative had been standing in plain sight since October 2006, when Simon Josefsson's RFC 4648 specified a URL- and filename-safe variant of base64 that swaps + and / for - and _, so an encoded value survives a path segment, a query string and a filesystem untouched.

Andrey Sitnik, better known for PostCSS and Autoprefixer, published Nano ID in 2017 on exactly that basis. The defaults encode a set of deliberate judgements. Twenty-one characters from a 64-character alphabet give 126 bits, slightly more than the 122 random bits in a version 4 UUID, in fifteen fewer characters. Randomness comes from the platform's cryptographic generator — crypto.getRandomValues in a browser, crypto.randomBytes in Node — rather than Math.random, with a separate nanoid/non-secure entry point for callers who would rather have the speed and know what they are giving up. For custom alphabets the implementation masks bits and discards out-of-range samples instead of taking a modulo, which would quietly over-represent the first characters of any alphabet whose size is not a power of two.

It displaced its predecessor fairly completely: the older shortid package is now deprecated on npm with a note pointing at Nano ID. Ports followed for Go, Rust, Python, Java, PHP, Ruby, Swift and many other languages, and version 4 of the JavaScript package dropped CommonJS support, which left a long tail of projects on version 3.

The trade-off is explicit. A Nano ID holds no timestamp, counter or machine identifier, so it leaks nothing about where or when it was made — and sorts in no useful order at all, the opposite of the choice UUID version 7 and MongoDB's ObjectId make.

主な性質

  • The default alphabet is 64 characters — A–Z, a–z, 0–9, hyphen and underscore — which is the base64url set defined in RFC 4648 section 5.
  • The default length is 21 characters, which at 6 bits per character is exactly 126 bits of entropy.
  • A 21-character Nano ID carries 126 bits against a version 4 UUID’s 122, in 21 characters rather than 36.
  • Every character of the default alphabet is safe unescaped in a URL path, a query string, a filename and an HTML attribute.
  • At 1,000 IDs per hour, reaching a 1% chance of a single collision takes roughly 149 billion years at the default length — the figure quoted by the library’s own collision calculator.
  • Because 64 divides 256, the default alphabet needs no bias correction; the rejection-sampling path in the reference implementation exists for alphabets whose size is not a power of two.
  • A Nano ID contains no timestamp, counter or machine identifier, so the IDs neither sort by creation time nor disclose anything about their origin.
  • The IDs on this page are generated from a seeded, non-cryptographic PRNG, which makes them reproducible from the URL and therefore unsuitable as real identifiers.

ほかの個数

出典