It applies only when every graha falls on one side of the Rahu-Ketu axis. Most kundlis do not, and this page says so clearly.
Example22 November 1988, 10:30 AM · Mumbai, Indiaenter your own birth details
No Kaal Sarp Dosh found. Your planets are distributed on both sides of the Rahu-Ketu axis.
There are 12 types of Kaal Sarp Dosh, named after different serpents, depending on the house positions of Rahu and Ketu: Anant, Kulik, Vasuki, Shankhpal, Padma, Mahapadma, Takshak, Karkotak, Shankhchur, Ghatak, Vishdhar, and Sheshnaag. Each type affects different life areas — for example, Anant Kaal Sarp (Rahu in 1st, Ketu in 7th) affects personality and marriage, while Padma Kaal Sarp (Rahu in 5th, Ketu in 11th) impacts children and gains. The effects are most pronounced during Rahu or Ketu Dasha periods.
Traditional remedies include: (1) Kaal Sarp Dosh Nivaran Puja at Trimbakeshwar (Nashik) or other Jyotirlinga temples, (2) Chanting Rahu Mantra (Om Raam Rahave Namaha) and Ketu Mantra, (3) Wearing Hessonite (Gomed) for Rahu or Cat's Eye for Ketu after consultation, (4) Performing Nag Puja on Nag Panchami, (5) Donating items associated with Rahu (blue cloth, sesame, coconut) on Saturdays. Many astrologers note that the Dosha's intensity decreases after age 33-35 for most individuals.
Every one of these reads the same kundli. If you have entered your details once here, the rest are the same question asked differently.
Kaal Sarp Dosh (also spelled Kala Sarpa Dosha) occurs when all seven planets (Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn) are hemmed between Rahu and Ketu in the birth chart. Rahu and Ketu are the north and south lunar nodes — shadow planets that represent karmic destiny. When all planets fall on one side of the Rahu-Ketu axis, it creates a serpent-like grip on the chart, believed to bring struggles, delays, and karmic challenges in specific life areas.
This page pulls a single reading out of your kundli. The kundli itself is free too, and has the rest of it.