Conference ranking according to CORE (Computer Networks area):

A+ conferences :

ACMMM ACM Multimedia Conference CCS ACM Conference on Computer and Communications Security CHI International Conference on Human Factors in Computing Systems CRYPTO Advances in Cryptology INFOCOM Joint Conference of the IEEE Computer and Communications Societies IPSN Information Processing in Sensor Networks ISWC IEEE International Symposium on Wearable Computing IWQoS IFIP International Workshop on QoS MOBICOM ACM International Conferencem on Mobile Computing and Networking PERCOM IEEE International Conference on Pervasive Computing and Communications PERVASIVE International Conference on Pervasive Computing SENSYS ACM Conference on Embedded Networked Sensor Systems SIGCOMM ACM Conference on Applications, Technologies,Architectures, and Protocols for Computer Communication SIGMETRICS ACM SIG on computer and communications metrics and performance UbiComp Uniquitous Computing

A conferences:

DIGRA Digital Games Research Conference DIS Designing Interactive Systems DISC International Symposium on Distributed Computing ESORICS European Symposium on Research in Computer Security EWSN European conference on Wireless Sensor Networks HOTNETS ACM Workshop on Hot Topics in Networks IC3N International Conference on Computer Communication and Networks ICC IEEE International Conference on Communications ICDCS IEEE International Conference on Distributed Computing Systems ICNP International Conference on Network Protocols IEEE-MM IEEE International Conference on Multimedia Computing and Systems IMC Internet Measurement Conference INTERACT IFIP International Conference on Human-Computer Interaction ICSPC IEEE International Conference on Distributed Computing Systems IPDPS IEEE International Parallel and Distributed Processing Symposium LCN IEEE Conference on Local Computer Networks MASCOTS Symposium Model Analysis & Simulation of Computer & Telecommunications Systems MASS IEEE International Conference on Mobile Ad-hoc and Sensor Systems MMCN ACM/SPIE Multimedia Computing and Networking MOBIHOC ACM Symposium of mobile and ad hoc computing Mobiquitous International Conference on Mobile and Ubiquitous Systems: Networks and Services Mobisys ACM SIGMOBILE International Conference on mobile systems, applications and Services MSWIM ACM/IEEE International Conference on Modelling, Analysis and Simulation of Wireless and Mobile Systems NDSS Usenix Networked and Distributed System Security Symposium Networking IFIP Networking 200X NOSSDAV Network and OS Support for Digital A/V NSDI Symposium on Networked Systems, Design and Implementation OPENARCH IEEE Conference on Open Architecture and Network Programming P2P IEEE International Conference on Peer-toPeer Computing PADS ACM/IEEE/SCS Workshop on Parallel & Distributed Simulation PERFORMANCE IFIP International Symposium on Computing Performance, Modelling, Measurement and Evaluation S&P IEEE Symposium on Security and Privacy WoWMoM IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks

B conferences:

ADHOC-NOW International Conference on AD-HOC Networks & Wireless CCW IEEE Computer Communications Workshop DCOSS IEEE Conference on Distributed Computing in Sensor Systems ESEA Euromicro International Conference on software engineering and applications EuroPDP EUROMICRO Conference on Parallel, Distributed and Network-Based processing Globecom EUROMICRO Conference on Parallel, Distributed and Network-Based processing ICDCN EUROMICRO Conference on Parallel, Distributed and Network-Based processing ICON IEEE International Conference on Networks ICPADS IEEE International Conference on Parallel and Distributed Systems ICSEC International Conferenceon Information and Communications Security ISCC IEEE Symposium on Computers & Communications IWCMC ACM International Wireless Communications and Mobile Computing Conference PDCAT ACM International Wireless Communications and Mobile Computing Conference PIMRC International Conference on Parallel and Distributed Computing, Applications and Technologies Qsine International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks SEC IFIP International Information Security Conference SECON IEEE Conference on Sensor, Mesh and Ad Hoc Communications and Networks SecureComm IEEE/CreateNet International Conference on Security and Privacy in Communication Networks WCNC IEEE Wireless Communications and Networking Conference WiOpt International. Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks