TCP & UDP Packet Sender

TCP & UDP Packet Sender is a focused network utility for developers, QA engineers, network admins, and hobbyists. Compose a message, choose a protocol, hit send, and see exactly what comes back — down to the byte.

COMPOSE & SEND
• Send TCP or UDP packets to any host and port
• Enter payloads as UTF-8/ASCII text or raw HEX (flexible hex parsing: spaces, 0x, commas, and \x are all accepted)
• Live byte counter and a full hex-dump preview before you send
• Send once, repeat a set number of times, or flood — with a configurable delay between sends
• Randomize the destination port on each send

SECURE CONNECTIONS
• TLS over TCP and DTLS over UDP with a single toggle
• Responses over secure connections are captured automatically

TCP CONNECTION OPTIONS
• No-delay (TCP_NODELAY) for lower latency
• Keepalive probes
• TCP Fast Open
• Send FIN (write-close) immediately after the payload

RECEIVE MODE (LISTENER)
• Run a local TCP or UDP server on a port you choose
• Watch incoming connections and data arrive in real time
• Live counters for active connections and messages received
• Everything received flows straight into the traffic log

TRAFFIC LOG & INSPECTOR
• Every packet sent and received is logged, newest first
• Inspect any capture as a classic hex dump, plain hex, or ASCII
• One-tap copy of any representation
• Clear the log anytime; history is saved between launches

PACKET LIBRARY
• Save packets you use often and reload them instantly
• Per-packet response history follows each saved packet
• Export your whole library to a JSON file and import it on another device

BUILT-IN TOOLS
• DNS forward lookup (hostname → IPv4/IPv6)
• Reverse DNS lookup (IP → hostname)
• Live hex ⇄ text converter

DESIGNED FOR iOS
• Universal app for iPhone and iPad
• Clean, modern interface with haptics and full dark-mode support

PRIVACY
No accounts, no analytics, no tracking, no ads, no third-party SDKs. Your packets, library, and logs never leave your device except when you explicitly export them. Traffic goes directly to the hosts you target — never to us.

WHAT THIS APP DOES NOT DO (PLEASE READ)
This app operates at the TCP/UDP (transport) layer using Apple's standard networking stack. Because iOS does not grant apps raw-socket access, it cannot:
• Craft raw IP or Ethernet frames
• Set raw TCP header flags such as SYN, ACK, RST, PSH, or URG (so it cannot perform SYN scans or spoofed segments)
• Send ICMP/ping, run a raw traceroute, or do ARP / Neighbor Discovery
• Build IPv6 extension headers or 6to4 tunnels

If you need TCP/UDP messaging, testing, and inspection — this is your tool. If you need raw packet crafting, that requires a desktop OS with root privileges.