It looks like this is a web page, not a feed. I looked for a feed associated with this page, but couldn't find one. Please enter the address of your feed to validate.

Source: https://usps-track.us

  1. <!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="360"></head><body><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "usps-track.app",cType: 'managed',cRay: '93d0110c5cc0c940',cH: 'r_s5QmDOQGP6RyWTml4XVMS1vlxfk_Ypv6AN4n2FFCI-1746781856-1.2.1.1-u4uQltAjR7HWatea616SgD8hXBSdr8m1H81hZdJdK88zBj0xjElXR3Gyhmx2Wz1o',cUPMDTk: "\/?__cf_chl_tk=G.uZIWaFBgnqSkFceuFypVtOhm75feSvH_6.CPKvgZI-1746781856-1.0.1.1-Q9L3e5LVFHmiRmLrijYU_vdvoj68ZLzn51oHToRmJfs",cFPWv: 'b',cITimeS: '1746781856',cTplC: 0,cTplV: 5,cTplB: 'cf',fa: "\/?__cf_chl_f_tk=G.uZIWaFBgnqSkFceuFypVtOhm75feSvH_6.CPKvgZI-1746781856-1.0.1.1-Q9L3e5LVFHmiRmLrijYU_vdvoj68ZLzn51oHToRmJfs",md: "vthUrILmyYcagAKKZEbnFaSYez2Gy5D7MYy2BYEpPwM-1746781856-1.2.1.1-zFf1Qlr8DtsT5uAiL22nAbLE9ibiUN5UkGADD1mZEanqEUzkv7LxOijt3aTTjjjm12xG74NrvX.h4WhvRztDCNrRyD3hW6TgI8ZUcPn.VA4Cg4h_Nv_8GvUHp5lQI70A6vZChXH1ejFU0s_5tygsLmpFpWlncFfHnOaIh8LvDxXuRzeXpNyo5gF_YAlxxok2iw6qJHD7mwCWYUxR9CWL5hZKcpd6Wxr7tVMPmdpRWNj5uEoDtHcZaKTINie...sjWefrxk_A6O6jwrM5gd.H4xtVpJi69wNqfqeRxGL8Cy.3sf4ExDqGLE.W3Z3AslHQPz.SI0yT7cWF3hxvfYAPAQqRc07qP_yuZ1Ev9xn.WqrPk4Dg.OvyIUVMGtdNWnTRAH5CeyDuVnit_NGM0Cx1BA3coGx0LA1L3JkxAnShazcOHvKr_7CICCl4MTYcVHPj3UZoCNXv8PV3RExY_UN0jRuYQQhUnRsSHtZllbf82WB3biPGmjRWGLh.EyHZC5p4gA.Xf8HoZ2YDY4uvriTpk0Sew1sfC3WaQZT1G8GIsY3NwD3HKoYlX0Kaxzvy3yVLAQYhiSlSuj5Y0AMnJgXRjcW1z37SruGCCw3VokOzsvPomhOWPMhRzcECIIF79a.geaFmMzx_4TmG9rJfbBNUGG5XqXnvxeFC5jLiOEd5sC5JZro7keCrPA6esrgMEOuZRBUD1liFP_9RDB9P_3SsVN4Ajp5U4s7xT5wO9ho83P1LPcj0y60QTY_uFkBJW8Sn98mnEWQ.n_wryVbSx4qlF1p3b8JapXfMwm.czPeRpRs",mdrd: "3lQ4NsCh9jUkIUJHCSFy2iQP2cXsDwPm9udx7.fB6As-1746781856-1.2.1.1-pO4McXa1oIu4qFm8eOIylkK1LjnxMo8K20pxE6yVEcHYzEuGAiBt_hZj6hdXPi9rdmCMzCb1AjSXwYSJBNcbHY_DYPoHqRNSDLEwmA2miqbNOcAoszeNFXnmj8piGfa2VvQazLK1oJyesDr.i5Dz6.pfC_UiYvZSbw7z.mtjL0KT578.aMq87rx0Q1g8ODBPoKLKyqsaIvuLX5zsrNFxFQ91.mcalInjhj3Q1huLVMItoi6arkBgVu__9NqgJBOsP_3yskL2ULjKchTqWLEdC0FdU2nHt3Gq9uYAcoK.dmuhg2xvbkJGM0K5kCoRMPbagvAp.IzE1GzggiBRxt4mvjs4iXtevPJrQqZ3buZjDngEmvCciK6BGfuWKDBMT53tlt1qr43sWeueH1DMAJEbLwYWeV9KE25AGFweVcxmSxrXGzt0OFboJB5rYlXKVsHyBEkks5J9K1aok4xzHnTVyyZvgy8GcLql2vRnqAo8KLTK7wIoB8tg2M67vu.nxWcy0TMFksMEzXreZLoqUVWboi8oXnMr9jxMUw6lV5lWgrDjMinNxdQ_0t0C9EGdCQ3a28Pvbd.hxLWmjs43zkiWt57i6_sMJXdwSpIFKtcWhr6sZVjqikh_5oPCRbkno8nxJztGn71r0pmobfrwJLRvdonGrC_RHgYU0lOXsvUNAysbrd8NVpLn0qcaURa5t_GmImwL.pAI37HYU982RhrWtulg3okaEX3c8q7V3a64XhaR9ceevTIscBalhnozJlFPfHe5P6thjFB8U4zV4GF7zdd4Mak6ZvGDgjysp_0oPEujC6SmprAqU36CQn_PtFFFkJIsOwRDTva4agUq0ReM_FzNAFfq48J1jGrrr44.JaUL8bTKoysUREKB1fMnYpwu39uP8L8AFLW0eOg.Gl3TzPcIWpxFlRsgunUb7u8jYCgfyle.tVFQTI.gxIRaI12oOgdF7EVJh1o9nTbpCQdednYCTEklY0cOOWu3q1GBbq3VV5CmqcD80WQFGOr6vZdzP.oA.nK22LDCYICwilhjw2T8GysvAO2NCDw1xPx34hhYbkFzUg5RuGyCOS82V18XoDRm81TPA7SeRSu_xgAp0OtE7DRZQjH8zaRSx84EURXQKEsB_ogfRy4_2mTtLkKzslfKGWGnJ6rWf1znaH9ZtLQajt77x44ZIYwiCGk_W71zt_YNy8OhsHsuXahTQSzGjrCrf.9svIEBblLmn0bEmh9BUfmVCg7jCs1Y44MhmAd89JfZB4jFS1MQNP1Ja77OSgOA_.XShB7uPFyEstE1u7O7PHnPA0dWL6qutdTIp_uviLnXwbtBKJHdMMNEvHQvUq0PmcHTd47C7b82Oe459oSTBL521xudxra8_7zmJvnhXWtMzarzN1q.7EKHdKck3f7.n4iqfCy.pIKYZkiifaGVeppmKNieVCdZmwZZA2VsnLpm0PqGmygb6Os42xZm1wAJxN63P.NRMwDGgA0PemVcxZ2i5elMsVMItnBAtuM7fOp6VfNwxuu1bJRHUyUDS1fIC60UrKteNa8ZgH5AI4krV2hBpYrxhSo2Zq3DAtMdfmFkNhfki1mRljS1Xo904Sf5ZYi5d8xO4DEqPOjGyY4MTQmWCMQLFdr7GMPTjvHEH27_BJIKNbQYlCRu9Jz.HudVJivsmCtdFnScqaUklN7bEkBaaGiOnLUv2oM05lKIn51rMzpQsPP1QjXmgrztIaujyM3btRTQcW_Xg34aiMPdmgS6v1gKhVPRJ_cvUcOkmYqxwpcifx.MvIVYteIsO9gie93vw4R6vvaH8lGYfApnzSijScSMKBj1kY7AGXLQPg.TsqP05Ls5Q1br2VDNJeIXBysvczQDsS02BeufRw"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=93d0110c5cc0c940';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/?__cf_chl_rt_tk=G.uZIWaFBgnqSkFceuFypVtOhm75feSvH_6.CPKvgZI-1746781856-1.0.1.1-Q9L3e5LVFHmiRmLrijYU_vdvoj68ZLzn51oHToRmJfs" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>
Copyright © 2002-9 Sam Ruby, Mark Pilgrim, Joseph Walton, and Phil Ringnalda