As per the surveys and Information available from previous year trends, the last ranks to get allocated the different services (unreserved category) are provided below-

2020:

• IAS – The last rank of a general category candidate allocated to IAS was 79.
• IFS – The last rank of a general category candidate allocated to IFS was 103.
• IPS – The last rank of a general category candidate allocated to IPS was 239.
• IRS (IT) – The last rank of a general category candidate allocated to IRS (IT) was 261.
• IRS (C&CE) – The last rank of a general category candidate allocated to IRS (IT) was 275.

2019:

• IAS – The last rank of a general category candidate allocated to IAS was 77.
• IFS – The last rank of a general category candidate allocated to IFS was 113.
• IPS – The last rank of a general category candidate allocated to IPS was 215.
• IRS (IT) – The last rank of a general category candidate allocated to IRS (IT) was 217.
• IRS (C&CE) – The last rank of a general category candidate allocated to IRS (IT) was 266.

2018:

• IAS – The last rank of a general category candidate allocated to IAS was 92.
• IFS – The last rank of a general category candidate allocated to IFS was 134.
• IPS – The last rank of a general category candidate allocated to IPS was 236.
• IRS (IT) – The last rank of a general category candidate allocated to IRS (IT) was 239.
• IRS (C&CE) – The last rank of a general category candidate allocated to IRS (IT) was 265.

For more information regarding UPSC CSE consider the link below:

https://competition.careers360.com/exams/upsc-cse

I hope this helps. Wish you a great eve!