Ethernet II Decoder
Decode Ethernet II frame headers from hex into source/destination MAC, EtherType, and payload details.
Open decoder
Decode protocol hex data into readable packet fields
Network & Wireless Protocol Decoders
Convert raw hex strings into structured protocol fields with size, meaning, and payload context. Useful for debugging captures, reverse engineering, and learning protocol internals.
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Network Protocols
IPv4 Decoder
Decode IPv4 packet headers from hex, including fragmentation, TTL, protocol, and addressing.
Open decoderIPv6 Decoder
Decode IPv6 packet fields from hex, including flow label, hop limit, and next header.
Open decoderARP Decoder
Decode ARP packet fields from hex to inspect hardware/protocol addresses and operations.
Open decoderICMP Decoder
Decode ICMP packet fields from hex including message type, code, checksum, and body.
Open decoderTransport Protocols
TCP Decoder
Decode TCP segment headers from hex to inspect ports, sequence numbers, flags, and options length.
Open decoderUDP Decoder
Decode UDP datagram headers from hex for source/destination ports, length, and checksum.
Open decoderApplication Protocols
DNS Decoder
Decode DNS message headers and question sections from hex into readable query details.
Open decoderHTTP Decoder
Decode hex-encoded HTTP requests and responses into start line, headers, and body preview.
Open decoderSIP Decoder
Decode SIP request and response messages from hex including start line, headers, and body preview.
Open decoderMQTT Decoder
Decode MQTT fixed header fields from hex including control packet type, flags, and remaining length.
Open decoderModbus TCP Decoder
Decode Modbus TCP ADU fields from hex including MBAP header, unit ID, function code, and request/response data.
Open decoderAMQP Decoder
Decode AMQP protocol headers and frame headers from hex including frame type, channel, and payload size.
Open decoderDHCP Decoder
Decode DHCP/BOOTP packet headers and options from hex into lease negotiation details.
Open decoderSecurity Protocols
TLS Record Decoder
Decode TLS record headers from hex for content type, protocol version, and record length.
Open decoderWLAN Protocols
Wi-Fi (802.11 MAC) Decoder
Decode basic 802.11 MAC header fields from hex, including frame control, addresses, and sequence control.
Open decoderBluetooth Protocols
Bluetooth LE Advertising Decoder
Decode BLE advertising PDU headers from hex into type, addressing flags, and payload length.
Open decoderBLE Link Layer (LL) Decoder
Decode BLE Link Layer PDU header fields including LLID, sequence bits, and payload length.
Open decoderBLE GAP Decoder
Decode basic BLE GAP payload hints such as AD type and role/discovery metadata.
Open decoderBLE ATT Decoder
Decode BLE Attribute Protocol (ATT) PDUs including opcode, handle, and parameter bytes.
Open decoderBLE GATT Decoder
Decode GATT-over-ATT operation framing for services, characteristics, and client/server access.
Open decoderBLE SMP Decoder
Decode Security Manager Protocol (SMP) pairing and key-management message headers.
Open decoderBLE L2CAP Decoder
Decode BLE L2CAP headers including payload length, channel ID, and encapsulated upper protocol.
Open decoderLTE Protocols Protocols
LTE MAC Decoder
Decode LTE MAC subheader fields from hex including extension bit, LCID, and payload length indicator.
Open decoderLTE PDCP Decoder
Decode LTE PDCP fixed header fields from hex including D/C indicator and sequence number.
Open decoderLTE NAS Decoder
Decode LTE NAS header fields from hex including security header type, protocol discriminator, and message type.
Open decoderLTE RRC ASN.1 Decoder
Decode LTE RRC ASN.1 payloads by selected interface and message type.
Open decoder5G Protocols Protocols
5G NAS Decoder
Decode 5G NAS header fields from hex including protocol discriminator, security header type, and message type.
Open decoder5G RRC ASN.1 Decoder
Decode 5G NR RRC ASN.1 payloads by selected interface and message type.
Open decoderGTP-U Decoder
Decode GTP-U tunnel headers from hex including flags, message type, length, and TEID.
Open decoderPFCP Decoder
Decode PFCP headers from hex including version, message type, length, SEID flag, and sequence number.
Open decoder5G MAC Decoder
Decode 5G NR MAC subheader fields from hex including LCID, format flag, and optional length.
Open decoder5G RLC Decoder
Decode 5G RLC header fields from hex including D/C indicator, sequence number, and segmentation info.
Open decoderPopular Protocol Search Targets
These are commonly researched by engineers and students: TCP, UDP, HTTP, DNS, TLS, IPv4/IPv6, ARP, ICMP, DHCP, Wi-Fi (802.11), and Bluetooth LE. NWTools.org includes decoder pages for each of these.