Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, IoT was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 15 days and the median time to publication was 39 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Alessandro Costantini | Kashif Saleem |
| Alfonso Rodríguez | Marco Antonio Sotelo Monge |
| Anas Fattouh | Matthias Wählisch |
| Anastasija Collen | Michele Nitti |
| Antonio Puliafito | Mingzhe Jiang |
| Benoit Parrein | Mohammad Shojafar |
| Birhanu Belay | Mohsen Ahmadi |
| Carlos Muñoz-Poblete | Nikos Fotiou |
| Carolina Del-Valle-Soto | Oskar Szumski |
| David Melendi | Panagiotis Tsarchopoulos |
| Dejan Drajic | Paulo Vitor Campos Souza |
| Deokwoo Lee | Piotr Sobotka |
| Dimitris Kogias | Ricardo Santos |
| Domenico Ursino | Sabah Suhail |
| Dora M. Ballesteros | Sandeep Jagtap |
| Emine Sezer | Sandeep Sony |
| Emira Mharouech | Sedat Akleylek |
| Evangelos Sakkopoulos | Shiven Sharma |
| Farhan Amin | Su Man Nam |
| Francesco Bergadano | Sung Suk Kim |
| Francesco Raffa | Sushil Kumar Singh |
| Francisco Bulnes | Tetsuya Yokotani |
| Georgios Tsaramirsis | Vijayakumar Varadarajan |
| Hasan Mahmood Aminul Islam | Wazen Shbair |
| Hessam Golmohamadi | Wensi Wang |
| Il Dong Yun | You-jin Song |
| Iyad Lahsen-Cherif | Youn-Sik Hong |
| Jesús Ángel Román Gallego | Zawar Shah |
| Jin-Gyun Chung |
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