Unadvertised Addresses in APNIC’s Registry

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Presentation transcript:

Unadvertised Addresses in APNIC’s Registry Geoff Huston APNIC

2000 – 2018: IPv4 Adddresses

2000 – 2018: IPv4 Addresses We ‘ran out’ of IPv4 addresses some years ago, yet some 23% of IPv4 addresses (or the equivalent of 45 /8s) that are described in the registry system as ‘assigned’ or ‘allocated’ are not advertised in BGP.

2000 – 2018: Unadvertised Addresses Peak aggregate volume of “reclaimed” addresses Initial exhaustion date

Per-RIR Breakdown – 2016 to now ARIN’s legacy pool has a high level of unadvertised addresses RIPE NCC and APNIC are both have 12% of their total IPv4 pool size as unadvertised addresses

Changes to the Unadvertised pool since 2016 Since 2016 the APNIC unadvertised pool has grown by 5M addresses

APNIC IPv4 data since 2016 This is a transfer of a /10 + /12 from ARIN to AliCloud

APNIC IPv4 Status - 2019 IPv4 Address span in Registry*: 880 M addresses Advertised Addresses: 770 M addresses Unadvertised Addresses: 110 M Addresses * Excluding 4.4M ‘reserved’ addresses

APNIC IPv4 Status - 2019 IPv4 Address span in Registry*: 880 M addresses Advertised Addresses: 770 M addresses Unadvertised Addresses: 110 M Addresses How “old” are these unadvertised addresses? Are they legacy addresses or are they more recently allocated addresses? * Excluding 4.4M ‘reserved’ addresses

APNIC “Age” profile of addresses absolute scale Address Exhaustion Pre-APNIC legacy allocations

Relative Age Profile for APNIC % scale 50% of unadvertised address are > 12 years ‘old’ Pre-APNIC legacy allocations

Unadvertised Period of APNIC Unadv Addresses How long has it been since this address was last seen in BGP?

Unadvertised Period of APNIC Unadv Addresses 10% of unadvertised addresses were last seen in BGP in 2018 55% of unadvertised addresses have not been seen in BGP for more than 11 years

Where are these Unadvertised Addresses? Rank CC Unadv Pool Name 1 CN 39,250,176 China 2 JP 34,462,208 Japan 3 IN 9,285,888 India 4 SG 6,311,424 Singapore 5 AU 6,228,480 Australia 6 KR 5,376,768 Republic of Korea 7 ID 1,901,312 Indonesia 8 TW 1,621,504 Taiwan 9 NZ 1,450,240 New Zealand 10 VN 1,044,992 Vietnam 11 HK 773,632 Hong Kong SAR 12 TH 760,832 Thailand 13 PH 748,288 Philippines 14 MY 670,464 Malaysia 15 BD 169,984 Bangladesh 16 PK 145,664 Pakistan 17 BN 71,424 Brunei Darussalam 18 US 70,656 United States of America 19 AF 62,976 Afghanistan 20 MM 45,824 Myanmar Using the APNIC registration Code in the registry

Where are these Unadvertised Addresses? Rank CC Unadv Pool Name 1 CN 38,491,648 China 2 JP 34,374,912 Japan 3 IN 9,546,496 India 4 AU 6,108,672 Australia 5 US 5,748,480 United States of America 6 KR 5,369,088 Republic of Korea 7 ID 1,898,240 Indonesia 8 TW 1,617,920 Taiwan 9 NZ 1,444,608 New Zealand 10 VN 1,037,312 Vietnam 11 SG 976,384 Singapore 12 PH 766,976 Philippines 13 TH 760,320 Thailand 14 HK 737,792 Hong Kong SAR 15 MY 655,872 Malaysia 16 NL 398,336 Netherlands 17 BD 167,936 Bangladesh 18 PK 117,504 Pakistan 19 BN 66,304 Brunei Darussalam 20 BE 65,536 Belgium Using the Maxmind geoloc database The differences between these two tables expose a larger issue with the interpretation of geolocation codes in the address registries which I won’t delve into here

Observations 110M addresses in the APNIC registry are not visible in the BGP routing table at present. This is 12% of the total size of the allocated IPv4 address pool in the APNIC registry 30% of the unadvertised pool in the APNIC registry was allocated/assigned by APNIC in the 3 year run up to pool exhaustion in 2011 Approximately 10% of the unadvertised pool is due to recent address transfers that are as-yet unadvertised Some 30% of the unadvertised pool is composed of pre-APNIC legacy address allocations (including AUNIC, and NZ registry transfers into APNIC that occurred in ~1999).

Notes This analysis used a local archive of the daily stats files generated by the RIRs If an address block is listed in the APNIC transfer log, I’ve used the date of the transfer rather than the original allocation/assignment date I have not included APNIC-reserved blocks in this analysis. 1,282 entries are marked “reserved” Reserved addresses total 4,423,680 addresses (roughly a /10) The BGP feed is taken from AS131072

Thanks Questions?