By using below link you can track your package,

USA https://tools.usps.com
UK https://www.parcelforce.com/track-trace
Australia https://auspost.com.au/track/
New Zealand https://www.nzpost.co.nz/tools/tracking
Russia https://www.pochta.ru/tracking
For ALL Countries http://ipsweb.ptcmysore.gov.in/ipswebtracking/