Autonomous system detail

AS1221

Announced

AS1221 announces 280 IPv4 and 2 IPv6 prefixes and peers with 288 other networks.

Summary

// analyst note
Routing counts and AS_PATH neighbours are a combined observation from route-views2 and route-views6 at 2026-11-03T14:00:00.000Z; neighbours do not establish verified peering or commercial relationships.
IPv4 prefixes
280
~13.4M addresses
IPv6 prefixes
2
announced
Peer networks
288
0 up · 0 down
IANA block
1-1876
Assigned by ARIN
[ 01 ] — Context

About this ASN.

Updated  ·  Confidence: Medium  ·  4 sources  ·  How this page is checked

The supplied evidence does not identify AS1221’s operator. It does show the ASN announcing 280 IPv4 prefixes and 2 IPv6 prefixes in a combined Route Views observation at 2026-11-03 14:00 UTC, so it was visible in routing at that snapshot. The IANA number block lists AS1221 within 1–1876 as assigned by ARIN; this does not identify an individual assignment or operator.

The combined observation covers route-views2 and route-views6. Its 285 observed AS_PATH neighbours are routing adjacencies, not verified peers or evidence of upstream, customer, or provider relationships. The IPv4 address estimate is 13,400,064. These figures describe that timestamp and collector scope; they do not establish current deployment, traffic prevalence, ownership, location, or safety.

For identification, compare the ASN and its announced prefixes against the specific route and timestamp under investigation, then check the relevant registry and first-party operator records for an explicit link to AS1221. Treat a mismatch or missing record as unresolved identity rather than proof of inactivity or misuse. The supplied evidence contains no operator, country, product, or security findings.

Routing status
280 IPv4 prefixes and 2 IPv6 prefixes observed in the combined Route Views snapshot at 2026-11-03 14:00 UTC.
Identity
Operator is Unknown in the supplied evidence; the IANA block is listed as assigned by ARIN.
Triage
Compare the ASN and relevant announced prefixes with the route and timestamp under investigation; observed AS_PATH neighbours do not establish commercial relationships.
RIR
ARIN [Confirmed] — https://www.iana.org/assignments/as-numbers/as-numbers-1.csv
Observation scope
combined RouteViews snapshot at 2026-11-03T14:00:00.000Z; route-views2, route-views6 [Confirmed] — https://archive.routeviews.org/route-views2/bgpdata/2026.11/RIBS/rib.20261103.1400.bz2
ASN
1221 [Confirmed] — https://www.iana.org/assignments/as-numbers/as-numbers-1.csv
Assignment class
Unknown [Unknown] — https://www.iana.org/assignments/as-numbers/as-numbers-1.csv
IPv4 prefix count
280 [Confirmed] — https://archive.routeviews.org/route-views2/bgpdata/2026.11/RIBS/rib.20261103.1400.bz2
IPv4 address estimate
13400064 [Confirmed] — https://archive.routeviews.org/route-views2/bgpdata/2026.11/RIBS/rib.20261103.1400.bz2
IPv6 prefix count
2 [Confirmed] — https://archive.routeviews.org/route-views2/bgpdata/2026.11/RIBS/rib.20261103.1400.bz2
Observed AS_PATH neighbour count
285 [Confirmed] — https://archive.routeviews.org/route-views2/bgpdata/2026.11/RIBS/rib.20261103.1400.bz2
AS_PATH neighbour sample
AS109, AS3356, AS3360, AS3573, AS4608, AS4637, AS4764, AS4801, AS4805, AS4825, AS4826, AS7474, AS7486, AS7545, AS9342, AS9408, AS9417, AS9426, AS9507, AS9518, AS9544, AS9880, AS9893, AS9912, AS10105, AS10235, AS10310, AS11019, AS12041, AS12654, AS13014, AS13150
[Confirmed] — https://archive.routeviews.org/route-views2/bgpdata/2026.11/RIBS/rib.20261103.1400.bz2
[ 02 ] — Announced prefixes

What this network routes.

282 prefixes total · as observed by RouteViews at 2026-11-06 · one collector view, not a global census
// IPv4 prefixes280
  1. 1.128.0.0/11/11
  2. 101.160.0.0/11/11
  3. 121.208.0.0/12/12
  4. 124.176.0.0/12/12
  5. 58.160.0.0/12/12
  6. 1.120.0.0/13/13
  7. 110.144.0.0/13/13
  8. 120.144.0.0/13/13
  9. 203.40.0.0/13/13
  10. 60.224.0.0/13/13
  11. 120.152.0.0/14/14
  12. 144.132.0.0/14/14
  13. 203.36.0.0/14/14
  14. 203.48.0.0/14/14
  15. 110.140.0.0/15/15
  16. 120.156.0.0/15/15
  17. 123.210.0.0/15/15
  18. 144.136.0.0/15/15
  19. 203.52.0.0/15/15
  20. 101.103.0.0/16/16
  21. 110.142.0.0/16/16
  22. 110.143.0.0/16/16
  23. 120.158.0.0/16/16
  24. 123.209.0.0/16/16
  25. 125.255.0.0/16/16
  26. 137.147.0.0/16/16
  27. 138.130.0.0/16/16
  28. 138.217.0.0/16/16
  29. 139.130.0.0/16/16
  30. 139.134.0.0/16/16
  31. 139.168.0.0/16/16
  32. 143.238.0.0/16/16
  33. 144.131.0.0/16/16
  34. 144.139.0.0/16/16
  35. 144.140.0.0/16/16
  36. 147.69.0.0/16/16
  37. 149.135.0.0/16/16
  38. 165.228.0.0/16/16
  39. 203.35.0.0/16/16
  40. 203.54.0.0/16/16
  41. 144.130.0.0/17/17
  42. 203.58.128.0/17/17
  43. 61.9.128.0/17/17
  44. 144.130.192.0/18/18
  45. 202.12.128.0/18/18
  46. 203.143.192.0/18/18
  47. 203.27.128.0/18/18
  48. 203.58.64.0/18/18
  49. 144.130.160.0/19/19
  50. 192.148.128.0/19/19
  51. 192.74.160.0/19/19
  52. 202.12.192.0/19/19
  53. 202.7.64.0/19/19
  54. 203.100.224.0/19/19
  55. 203.58.32.0/19/19
  56. 210.23.128.0/19/19
  57. 61.8.0.0/19/19
  58. 144.130.144.0/20/20
  59. 192.74.144.0/20/20
  60. 192.74.192.0/20/20
  61. 202.1.240.0/20/20
  62. 202.12.224.0/20/20
  63. 203.14.0.0/20/20
  64. 203.18.112.0/20/20
  65. 203.29.160.0/20/20
  66. 192.148.120.0/21/21
  67. 203.12.144.0/21/21
  68. 203.17.40.0/21/21
  69. 203.62.248.0/21/21
  70. 158.45.0.0/22/22
  71. 158.45.60.0/22/22
  72. 164.108.24.0/22/22
  73. 192.148.116.0/22/22
  74. 192.148.160.0/22/22
  75. 192.74.140.0/22/22
  76. 203.16.180.0/22/22
  77. 203.26.8.0/22/22
  78. 203.30.92.0/22/22
  79. 203.32.16.0/22/22
  80. 203.62.148.0/22/22
  81. 103.226.244.0/23/23
  82. 103.247.118.0/23/23
  83. 122.200.24.0/23/23
  84. 192.148.164.0/23/23
  85. 202.12.240.0/23/23
  86. 203.14.116.0/23/23
  87. 203.24.134.0/23/23
  88. 203.24.32.0/23/23
  89. 203.30.92.0/23/23
  90. 203.30.94.0/23/23
  91. 203.31.62.0/23/23
  92. 203.34.78.0/23/23
  93. 203.55.14.0/23/23
  94. 203.9.190.0/23/23
  95. 103.136.214.0/24/24
  96. 103.136.215.0/24/24
  97. 103.149.43.0/24/24
  98. 103.195.64.0/24/24
  99. 103.247.118.0/24/24
  100. 103.247.119.0/24/24
  101. 103.58.212.0/24/24
  102. 103.58.34.0/24/24
  103. 103.58.35.0/24/24
  104. 103.78.241.0/24/24
  105. 129.41.78.0/24/24
  106. 136.238.200.0/24/24
  107. 143.223.18.0/24/24
  108. 143.223.87.0/24/24
  109. 146.144.9.0/24/24
  110. 148.80.1.0/24/24
  111. 149.176.112.0/24/24
  112. 149.176.116.0/24/24
  113. 149.176.172.0/24/24
  114. 149.176.221.0/24/24
  115. 149.176.223.0/24/24
  116. 149.176.225.0/24/24
  117. 149.176.226.0/24/24
  118. 149.176.227.0/24/24
  119. 149.176.244.0/24/24
  120. 149.176.246.0/24/24
  121. 149.176.248.0/24/24
  122. 149.176.250.0/24/24
  123. 149.176.251.0/24/24
  124. 149.176.252.0/24/24
  125. 149.176.253.0/24/24
  126. 149.176.254.0/24/24
  127. 149.176.255.0/24/24
  128. 156.22.1.0/24/24
  129. 156.22.2.0/24/24
  130. 158.146.145.0/24/24
  131. 158.146.152.0/24/24
  132. 158.45.100.0/24/24
  133. 158.45.104.0/24/24
  134. 158.45.112.0/24/24
  135. 158.45.116.0/24/24
  136. 158.45.120.0/24/24
  137. 158.45.13.0/24/24
  138. 158.45.14.0/24/24
  139. 159.222.184.0/24/24
  140. 160.187.61.0/24/24
  141. 164.108.10.0/24/24
  142. 164.108.105.0/24/24
  143. 164.108.17.0/24/24
  144. 164.108.181.0/24/24
  145. 164.108.9.0/24/24
  146. 168.233.31.0/24/24
  147. 180.94.27.0/24/24
  148. 192.111.105.0/24/24
  149. 192.131.150.0/24/24
  150. 192.158.45.0/24/24
  151. 192.195.197.0/24/24
  152. 192.243.20.0/24/24
  153. 192.243.21.0/24/24
  154. 192.243.22.0/24/24
  155. 192.243.23.0/24/24
  156. 192.74.139.0/24/24
  157. 192.74.208.0/24/24
  158. 198.57.15.0/24/24
  159. 202.12.242.0/24/24
  160. 202.3.74.0/24/24
  161. 202.36.14.0/24/24
  162. 202.4.181.0/24/24
  163. 202.58.226.0/24/24
  164. 202.70.143.0/24/24
  165. 202.8.92.0/24/24
  166. 202.93.155.0/24/24
  167. 203.11.4.0/24/24
  168. 203.12.132.0/24/24
  169. 203.12.231.0/24/24
  170. 203.12.62.0/24/24
  171. 203.12.83.0/24/24
  172. 203.13.76.0/24/24
  173. 203.13.77.0/24/24
  174. 203.14.160.0/24/24
  175. 203.14.161.0/24/24
  176. 203.14.222.0/24/24
  177. 203.14.223.0/24/24
  178. 203.148.93.0/24/24
  179. 203.15.254.0/24/24
  180. 203.15.68.0/24/24
  181. 203.16.140.0/24/24
  182. 203.17.162.0/24/24
  183. 203.18.34.0/24/24
  184. 203.18.35.0/24/24
  185. 203.2.228.0/24/24
  186. 203.20.197.0/24/24
  187. 203.20.199.0/24/24
  188. 203.20.238.0/24/24
  189. 203.20.239.0/24/24
  190. 203.20.43.0/24/24
  191. 203.20.87.0/24/24
  192. 203.21.192.0/24/24
  193. 203.21.193.0/24/24
  194. 203.21.194.0/24/24
  195. 203.21.195.0/24/24
  196. 203.21.196.0/24/24
  197. 203.21.197.0/24/24
  198. 203.21.198.0/24/24
  199. 203.21.199.0/24/24
  200. 203.21.49.0/24/24
  201. 203.21.50.0/24/24
  202. 203.21.51.0/24/24
  203. 203.21.52.0/24/24
  204. 203.21.53.0/24/24
  205. 203.21.54.0/24/24
  206. 203.21.55.0/24/24
  207. 203.21.56.0/24/24
  208. 203.21.57.0/24/24
  209. 203.21.58.0/24/24
  210. 203.21.59.0/24/24
  211. 203.21.63.0/24/24
  212. 203.22.134.0/24/24
  213. 203.22.147.0/24/24
  214. 203.22.150.0/24/24
  215. 203.22.83.0/24/24
  216. 203.23.20.0/24/24
  217. 203.23.21.0/24/24
  218. 203.23.41.0/24/24
  219. 203.23.75.0/24/24
  220. 203.23.86.0/24/24
  221. 203.24.126.0/24/24
  222. 203.24.170.0/24/24
  223. 203.24.194.0/24/24
  224. 203.25.142.0/24/24
  225. 203.25.248.0/24/24
  226. 203.25.253.0/24/24
  227. 203.26.175.0/24/24
  228. 203.26.245.0/24/24
  229. 203.27.193.0/24/24
  230. 203.27.225.0/24/24
  231. 203.27.56.0/24/24
  232. 203.27.69.0/24/24
  233. 203.27.72.0/24/24
  234. 203.28.234.0/24/24
  235. 203.29.94.0/24/24
  236. 203.3.100.0/24/24
  237. 203.3.101.0/24/24
  238. 203.3.102.0/24/24
  239. 203.30.201.0/24/24
  240. 203.30.64.0/24/24
  241. 203.31.63.0/24/24
  242. 203.32.16.0/24/24
  243. 203.32.17.0/24/24
  244. 203.32.18.0/24/24
  245. 203.33.151.0/24/24
  246. 203.33.251.0/24/24
  247. 203.34.131.0/24/24
  248. 203.34.223.0/24/24
  249. 203.34.228.0/24/24
  250. 203.34.229.0/24/24
  251. 203.34.41.0/24/24
  252. 203.34.68.0/24/24
  253. 203.4.130.0/24/24
  254. 203.4.131.0/24/24
  255. 203.4.192.0/24/24
  256. 203.4.193.0/24/24
  257. 203.4.196.0/24/24
  258. 203.5.176.0/24/24
  259. 203.5.177.0/24/24
  260. 203.5.58.0/24/24
  261. 203.5.88.0/24/24
  262. 203.55.180.0/24/24
  263. 203.55.186.0/24/24
  264. 203.55.98.0/24/24
  265. 203.56.94.0/24/24
  266. 203.57.219.0/24/24
  267. 203.6.127.0/24/24
  268. 203.6.171.0/24/24
  269. 203.62.202.0/24/24
  270. 203.62.205.0/24/24
  271. 203.8.107.0/24/24
  272. 203.8.90.0/24/24
  273. 203.92.248.0/24/24
  274. 203.92.252.0/24/24
  275. 206.225.235.0/24/24
  276. 66.111.164.0/24/24
  277. 66.111.166.0/24/24
  278. 66.111.168.0/24/24
  279. 66.111.171.0/24/24
  280. 66.111.173.0/24/24
// IPv6 prefixes2
  1. 2001:8000::/20/20
  2. 2401:a480::/48/48
[ 03 ] — Notable peers & upstreams

Who it talks to.

288 observed neighbours
// Notable connections32 of 288 observed

Neighbours observed by RouteViews at 2026-11-06, lowest ASN first. Relationships are inferences from the CAIDA AS Relationships Dataset, 2026-08-01, and establish no commercial arrangement; a dash means the inference did not resolve.

ASNOperatorRole
AS109 Cisco Systems, Inc. —
AS3356 Level 3 Parent, LLC (Lumen Technologies) —
AS3360 — —
AS3573 — —
AS4608 — —
AS4637 — —
AS4764 — —
AS4801 — —
AS4805 — —
AS4825 — —
AS4826 — —
AS7474 — —
AS7486 — —
AS7545 — —
AS9342 — —
AS9408 — —
AS9417 — —
AS9426 — —
AS9507 — —
AS9518 — —
AS9544 — —
AS9880 — —
AS9893 — —
AS9912 — —
AS10105 — —
AS10235 — —
AS10310 — —
AS11019 — —
AS12041 — —
AS12654 — —
AS13014 — —
AS13150 — —
Neighbours observed via public BGP collectors; not a complete peering list.