The Telenegar Ping Check Tool is a network connectivity diagnostic utility designed to measure reachability, round-trip packet latency, and packet loss from remote probe vantage points to any target IPv4/IPv6 address or domain hostname.

It supports both standard ICMP Ping protocol testing and TCP Ping testing (useful when ICMP echo requests are filtered by firewalls or when shell/raw-socket access is restricted on probe nodes).

The Ping Check interface provides customized parameters to test reachability across different transport modes and probes:

• ICMP Ping Probes: Uses raw ICMP Echo Request/Reply packets (`ping`). Provides true network-layer latency and packet loss metrics.
  • *Example:* Tehran, Iran — Atrin Information & Communications Technology Company
• TCP Ping Probes: Uses TCP `SYN` handshakes to measure response times to a specific TCP port (`TCP Ping`). Used when probes lack raw socket/shell permissions or when targets block ICMP traffic.
  • *Example:* Falkenstein, Germany — Hetzner Online GmbH

<note warning> Probes operating in TCP Ping mode test whether a specific TCP port responds rather than sending raw ICMP echo requests. While useful for verifying port-level reachability, latency values reflect the TCP three-way handshake time rather than ICMP echo response time. </note>

# **Enter Target Host Name or IP:** Type the domain or IP into the input field (e.g., ''s231.mehost.co'').
# **Select Packet Count:** Choose the number of probe packets to send from the **PACKET COUNT** dropdown menu (e.g., ''4 packets'').
# **Set TCP Port (If Applicable):** If using a TCP Ping probe, specify the target TCP port in the **TCP PORT** field (e.g., ''443'' for web servers, ''25'' or ''587'' for mail servers).
# **Select Probe Location & Protocol:** Open the **PROBE** dropdown menu and select an active probe under either **ICMP Ping** or **TCP Ping (no shell access)**.
# **Execute Test:** Click the blue **Ping** button to initiate packet transmission and view min/avg/max latency (ms) and packet loss percentage.

Determine whether a host or server is online and responding from domestic or international vantage points. A 100% packet loss indicates an offline host, network outage, or strict firewall blocking.

If a server fails an ICMP Ping but passes a TCP Ping on port `443` or `80`, the host is online and functioning, but its edge firewall is dropping ICMP echo requests.

Test TCP reachability on service-specific ports to verify edge firewalls are open:

• Port `443` / `80` — Web server reachability (audit further with Telenegar Site Check Tool).
• Port `25` / `587` / `993` — Mail server reachability (audit further with Telenegar Mail Check Tool).

Compare round-trip times (RTT) across European and Iranian probes to evaluate route latency, BGP routing paths, and network degradation.

• Telenegar Site Check Tool — Test website HTTP/HTTPS availability, redirects, and SSL certificates.
• Telenegar DNS Check Tool — Query DNS record resolution, propagation, and DNSSEC validation.
• Telenegar Mail Check Tool — Diagnostic tool for email security, SPF, DKIM, and DMARC checks.
• Cybersecurity Best Practices — Infrastructure hardening and firewall rule guidelines.
• Reverse DNS (PTR) — Match server IP addresses to hostnames.