Network Packet Captures Library

Network packet capture library illustration

Explore our curated collection of real-world packet captures designed to illustrate key networking concepts, protocols, and anomalies. From DNS queries to TCP errors and security events, each capture is hand-picked to support learning, troubleshooting, and deep analysis.

🔄 This library is updated regularly — new packet captures are added over time to reflect key concepts, attack patterns, and diagnostic scenarios.
Perfect for network engineers, students, and curious explorers alike.

TCP Examples

TCP simple session

A simple example showing a TCP flow with handshake, data transfer and closing.

View TCP classic session

Connection Timeout

The TCP connection to a service has failed.

View TCP Connection Timeout

Connection Aborted

The connection was aborted during the transfer of data.

View TCP Connection Aborted

Not RFC 7323 compliant

TCP window scale or timestamp option is missing.

View Not RFC 7323 compliant

TCP Retransmission

TCP loss may degrade the performances of data transfer.

View TCP Retransmission

TCP Fast Retransmission

TCP loss may degrade the performances of data transfer.

View TCP Fast Retransmission

TCP Zero Window

TCP Zero Window is a condition where the receiving device tells the sender to pause sending data because its buffer is full.

View TCP Zero Window

Segment out of Window

The segment is out of receiver window (Spurious Retransmission is one particular case).

View TCP Segment out of Window

TCP Spurious Retransmission

An already received segment is sent again.

View TCP Spurious Retransmission

DNS Examples

Basic DNS Query

Standard A record request and response using UDP port 53.

View classic DNS transaction

Name Error

A DNS name error occurred (also known as NXDOMAIN).

View DNS NXDOMAIN

No server response

DNS queries did not get any response.

View DNS No server response

Server failure

The DNS server failed to process a query.

View DNS Server failure

DNS Retransmissions

Some DNS requests were retransmitted.

View DNS Retransmissions

Truncated Message

Some DNS messages exceeded the allowed size.

View DNS Truncated Message

Request Refused

A query was refused to be processed by the server.

View DNS Request Refused

DNSSEC

DNSSEC (Domain Name System Security Extensions) is a security protocol that protects the DNS (Domain Name System) from attacks like spoofing or cache poisoning.

View DNSSEC examples