: This would represent a specific sorting district within that region.
: These denote the specific delivery post office . Potential Explanations 155891 zip
: Indicates the Northern Zone , covering states like Delhi, Haryana, Punjab, Himachal Pradesh, Jammu & Kashmir, and Uttar Pradesh. : This would represent a specific sorting district
: These are 6 digits long. While 155891 has the correct number of digits for India, official directories from India Post and regional databases like PincodeLookup do not list this specific code as active. Understanding the Structure covering states like Delhi
: These are consistently 5 digits long. A 6-digit number like 155891 does not fit this format.