What is the reputation of the IIIT Allahabad outside of India?

This is a really nice question to ask. IITs only focus on developing good engineers, it does not focus on the mindset of people.

For a moment, let us forget about the packages and only focus on popularity. The popularity of an institute depends on how old it is because this impacts the alumni network, its history, and oral communication which contributes to publicity. 

• When asked for advice, many people talk about IITs and NITs because they have been functioning for so many years now and more importantly, were at their best.
• If you ask a current engineering student for advice, you will get better suggestions. There are 25 IIITs in India and not all are famous. But, IIIT Allahabad and IIIT Hyderabad are at their best and par with IITs in terms of academic standards.
• Factors such as academic curriculum, infrastructure, faculty, culture, placements, etc, should be the factors to be considered rather than how many might have heard of it or how popular the institution is.
• The course curriculum is something that IIIT Allahabad should proudly brag of. 
• It offers a great coding environment and is way better than MNNIT Allahabad. Also, IIIT Allahabad is ranked number in SPOJ Rankings.

In the coming years, IIIT Allahabad will surely be among the top popular institutions in India. IIITS are central government-funded institutes that specialize in Information Technology, which the IITs do not provide.

Harsha Suryanarayana, one of India’s first Red Coders, was from IIIT Allahabad and every IT person must have heard of him. He also represented IIIT Allahabad in the ACM ICPC World Finals. When it comes to regional rounds, many teams from the institutions win in comparison to teams one or two teams from MNNIT.

Talking about rankings and placements, IIIT Allahabad is above about 25 NITs and many new IITs.