IPv6 - Revision history

NickPGSmith: /* Subnetting */

2026-07-29T12:44:37Z

Subnetting

← Older revision		Revision as of 12:44, 29 July 2026
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	would have the network 2003:1000:1000, the subnet 1600, so together the prefix 2003:1000:1000:1600. If the ISP delegated a part of the prefix to the consumer (e.g. 2003:1000:1000:1600/56) then the subnets from 2003:1000:1000:1600 to 2003:1000:1000:16FF could be used for private purposes (ie define 256 subnets).		would have the network 2003:1000:1000, the subnet 1600, so together the prefix 2003:1000:1000:1600. If the ISP delegated a part of the prefix to the consumer (e.g. 2003:1000:1000:1600/56) then the subnets from 2003:1000:1000:1600 to 2003:1000:1000:16FF could be used for private purposes (ie define 256 subnets).

			=== Special Addresses ===

	{\| class="wikitable"		{\| class="wikitable"

NickPGSmith: /* Subnetting */

2026-07-29T12:43:49Z

Subnetting

← Older revision		Revision as of 12:43, 29 July 2026
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	\|/64\|\|next 16 bits\|\|Subnet prefix (eg consumer)		\|/64\|\|next 16 bits\|\|Subnet prefix (eg consumer)
	\|-		\|-
	\|/128\|\|last 64 bits\|\|Interface ID		\|/128\|\|last 64 bits\|\|Interface ID (for host)
	\|-		\|-
	\|}		\|}

NickPGSmith: /* Addresses */

2026-07-29T12:42:33Z

Addresses

← Older revision		Revision as of 12:42, 29 July 2026
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	\|}		\|}

	Subnetting:		=== Subnetting ===

	{\| class="wikitable"		{\| class="wikitable"

NickPGSmith: /* Tools and usage */

2026-07-28T15:55:52Z

Tools and usage

← Older revision		Revision as of 15:55, 28 July 2026
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	Note that ping for link-local addresses may need to specify the interface.		Note that ping for link-local addresses may need to specify the interface.

			Cloudflare DNS:
			* Standard (1.1.1.1)
			** Primary: 2606:4700:4700::1111
			** Secondary: 2606:4700:4700::1001
			* Blocks Malware
			** Primary: 2606:4700:4700::1112
			** Secondary: 2606:4700:4700::1002
			* Blocks Malware & Adult Content
			** Primary: 2606:4700:4700::1113
			** Secondary: 2606:4700:4700::1003

			Zen DNS:
			* Primary: 2a02:8010:6:0:212:23:3:100
			* Secondary: 2a02:8010:6:0:212:23:6:100

	== Protocols ==		== Protocols ==

NickPGSmith: /* Addresses */

2026-07-28T15:25:42Z

Addresses

← Older revision		Revision as of 15:25, 28 July 2026
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	Unicast Scopes:		Unicast Scopes:
	* ~~Global~~: ~~everything (~~i.e. the ~~whole internet~~)		* Unspecified: no IPv6 address assigned
	** Unique ~~local addresses~~ have global scope but are not globally administered		** 0:0:0:0:0:0:0:0 or ::
			* Loopback
			** ::1
			* Link Local: will never be routed, valid in one collision domain, i.e. on the same switch)
			** Must be fe80/10
			** eg fe80::1100:697a:3210:3331/10
			* Site Local
			** Deprecated, instead use ULA
			* Unique Local Address (ULA) have global scope but are not globally administered
			** Routable within an internal network
			** Stable against ISP changes
			** fd00::/8 -> locally assigned
			** fc00::/8 -> future use
			* Global Unicast Address (GUA): everything (i.e. the whole Internet)
			** 001 Global Routing Prefix (GRP) \| Subnet ID (SID) \| (128-GRP-SID) bits for Interface ID
			*** GRP: 2000 - 3fff
	** eg 2001:2eb8:adc1:54ed:1100:697a:3210:3331/64		** eg 2001:2eb8:adc1:54ed:1100:697a:3210:3331/64
	*** 2001:2eb8:adc1:54ed : network		*** 2001:2eb8:adc1:54ed : network
	*** 1100:697a:3210:3331 : interface ID		*** 1100:697a:3210:3331 : interface ID
	* ~~Link Local: will never be routed, valid in one collision domain, i.e. on the same switch)~~
	** ~~eg fe80::1100:697a:3210:3331/10~~		* IPv4 mapped IPv6
	** eg ~~loopback~~: ::1		** 80 zero bits \| 16 one bits \| 32 bits of IPv4
	* Unspecified: no IPv6 address assigned		** eg ::ffff:192.168.1.1
	** 0:0:0:0:0:0:0:0 or ::

	Link-local addresses can be used to reach the neighbouring nodes attached to the same link; they do not need a globally unique address to communicate. Routers will not forward datagram using link-local addresses. IPv6 routers must not forward packets that have link-local source or destination addresses to other links. All IPv6 enabled interfaces have a link-local unicast address.		Link-local addresses can be used to reach the neighbouring nodes attached to the same link; they do not need a globally unique address to communicate. Routers will not forward datagram using link-local addresses. IPv6 routers must not forward packets that have link-local source or destination addresses to other links. All IPv6 enabled interfaces have a link-local unicast address.

NickPGSmith: /* Addresses */

2026-07-28T15:05:56Z

Addresses

← Older revision		Revision as of 15:05, 28 July 2026
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	*** 1100:697a:3210:3331 : interface ID		*** 1100:697a:3210:3331 : interface ID
	* Link Local: will never be routed, valid in one collision domain, i.e. on the same switch)		* Link Local: will never be routed, valid in one collision domain, i.e. on the same switch)
	** Link local addresses and loopback
	** eg fe80::1100:697a:3210:3331/10		** eg fe80::1100:697a:3210:3331/10
			** eg loopback: ::1
			* Unspecified: no IPv6 address assigned
			** 0:0:0:0:0:0:0:0 or ::

	Link-local addresses can be used to reach the neighbouring nodes attached to the same link; they do not need a globally unique address to communicate. Routers will not forward datagram using link-local addresses. IPv6 routers must not forward packets that have link-local source or destination addresses to other links. All IPv6 enabled interfaces have a link-local unicast address.		Link-local addresses can be used to reach the neighbouring nodes attached to the same link; they do not need a globally unique address to communicate. Routers will not forward datagram using link-local addresses. IPv6 routers must not forward packets that have link-local source or destination addresses to other links. All IPv6 enabled interfaces have a link-local unicast address.

NickPGSmith: /* Addresses */

2026-07-28T15:02:56Z

Addresses

← Older revision		Revision as of 15:02, 28 July 2026
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	** 8 hextets		** 8 hextets
	** 4 hex characters (16 bits) per hextet		** 4 hex characters (16 bits) per hextet
	** /64 (decimal): 64 bits in the Network Prefix		** /64 (decimal): First 64 bits are the Network Prefix, remaining 64 bits for interface ID
	** remaining 64 bits for interface ID
	** no subnet masks		** no subnet masks
	* Address Compression:		* Address Compression:

NickPGSmith: /* Addresses */

2026-07-28T15:01:26Z

Addresses

← Older revision		Revision as of 15:01, 28 July 2026
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	** 8 hextets		** 8 hextets
	** 4 hex characters (16 bits) per hextet		** 4 hex characters (16 bits) per hextet
	** /64 (decimal): 64 bits in the ~~network prefix~~		** /64 (decimal): 64 bits in the Network Prefix
	** remaining 64 bits for interface ID		** remaining 64 bits for interface ID
	** no subnet masks		** no subnet masks

NickPGSmith: 2 revisions imported

2024-05-08T04:53:36Z

2 revisions imported

← Older revision	Revision as of 04:53, 8 May 2024
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NickPGSmith: 1 revision imported

2023-02-17T21:02:09Z

1 revision imported

← Older revision	Revision as of 21:02, 17 February 2023
(No difference)