- None announced
- August 16: A minor release, ns-3.28.1, was published.
- May 14-August 14: Google Summer of Code projects.
- WenYing Dai, "Implementation of AccECN and ECN++ in ns-3"
- Muhammad Iqbal CR, "Merging and Improvement of LTE and Wi-Fi Coexistence Module"
- Sourabh Jain, "Direct Code Execution upgrade"
- Davide Magrin, "A simulation execution manager for ns-3"
- Jude Niroshan, "Trust-based routing protocols framework"
- June 11-15: The annual Workshop on ns-3 and annual meeting of the ns-3 Consortium was held at NITK Surathkal, India.
- March 22: A new feature release, ns-3.28, was published.