IP address

wikipedia:IP address

Internet Protocol version 4 (IPv4) defines an IP address as a 32-bit number. IP addresses are written and displayed in human-readable notations, such as 172.16.0.1 in IPv4.

• Ansible jinja2 templates provides filter to test is a IP is valid.

Find Public IP address from command line

• curl checkip.amazonaws.com
• curl ifconfig.me
• curl icanhazip.com
• curl ipecho.net/plain
• curl ifconfig.co
• curl -4 https://ifconfig.co

Related terms

• whois
• ip2location
• geoiplookup
• subnet mask
• Cisco IOS: ip address (command)
• Duplicate ip address:
  • Cisco IOS: show ip dhcp conflict
• EIP (AWS)

See also

• IP, IPv4, IPv6, subnet, CIDR, netmask, IP address, Public IP, Private IP, AWS Elastic IP (EIP), Geo restriction, Ipstack, IPAM, Static, BYOIP
• ip [link, route], ifconfig netstat ss lsof ping ethtool mii-tool arping nmcli(RHEL) route networkctl, netplan, tc
• TCP/IP, Transport protocol, UDP, SCTP, QUIC, subnet mask, Routing protocols: BGP, routing table, Policy based routing, multicast, TCP Fast Open, RDP, TTL, RTT, MPTCP, Large send offload (LSO): (TSO, GRO, GSO, TCP checksum), ethtool, SCTP, 5-Tuple, Check TCP connectivity, TCP window size, /proc/sys/net/ipv4/tcp_rmem, ack, List of TCP ports, localhost, broadcast address
• DNS: Linux DNS, IP, systemd-resolve, /etc/hosts, whois, Domain registrar, dig, host, nslookup, scutil --dns dnsmasq, bind, delv, .local, .internal, .onion, FQDN, TTL, /etc/resolv.conf, /etc/systemd/resolved.conf, dscacheutil (macOS), hostname, hostnamectl, bind, resolvectl status, DNS sinkhole, Domain name server, LLMNR, Resource records:MX, TXT, NS, CAA, SSHFP, Apex, CNAME, Wildcard DNS records, Subdomain, /etc/nsswitch.conf, 1.1.1.1, 8.8.8.8, CoreDNS, dnsPolicy:, Google Public DNS, DNS caches, Kubernetes ExternalDNS, DNS forwarding, IDNA2008, DNS-1035, Domain name registrars, Split-view DNS, Pi-hole, NextDNS
• Ethernet: MII, MDI, bonding, etherchannel, STP, ARP, MAC, STP, Jumbo frames, 802.1X, MTU, Ethernet In-Band Access (IBA), LACP, Multicast, Broadcast, SPI

https://docs.ansible.com/ansible/latest/user_guide/playbooks_filters.html#ip-address-filter