The Border Gateway Protocol (BGP) is the protocol backing the core routing decisions on the Internet. It maintains a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). It is described as a path vector protocol. BGP does not use traditional Interior Gateway Protocol (IGP) metrics, but makes routing decisions based on path, network policies and/or rulesets. For this reason, it is more appropriately termed a reachability protocol rather than routing protocol.

Thursday, April 26, 2012

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Fri 27 Apr, 2012

Report Website: http://thyme.rand.apnic.net
Detailed Analysis: http://thyme.rand.apnic.net/current/

Analysis Summary
----------------

BGP routing table entries examined: 408139
Prefixes after maximum aggregation: 173028
Deaggregation factor: 2.36
Unique aggregates announced to Internet: 198007
Total ASes present in the Internet Routing Table: 40825
Prefixes per ASN: 10.00
Origin-only ASes present in the Internet Routing Table: 33100
Origin ASes announcing only one prefix: 15615
Transit ASes present in the Internet Routing Table: 5461
Transit-only ASes present in the Internet Routing Table: 139
Average AS path length visible in the Internet Routing Table: 4.5
Max AS path length visible: 64
Max AS path prepend of ASN ( 9902) 56
Prefixes from unregistered ASNs in the Routing Table: 395
Unregistered ASNs in the Routing Table: 129
Number of 32-bit ASNs allocated by the RIRs: 2631
Number of 32-bit ASNs visible in the Routing Table: 2264
Prefixes from 32-bit ASNs in the Routing Table: 5655
Special use prefixes present in the Routing Table: 2
Prefixes being announced from unallocated address space: 117
Number of addresses announced to Internet: 2539305296
Equivalent to 151 /8s, 90 /16s and 185 /24s
Percentage of available address space announced: 68.5
Percentage of allocated address space announced: 68.6
Percentage of available address space allocated: 99.9
Percentage of address space in use by end-sites: 92.4
Total number of prefixes smaller than registry allocations: 174383

APNIC Region Analysis Summary
-----------------------------

Prefixes being announced by APNIC Region ASes: 99812
Total APNIC prefixes after maximum aggregation: 32274
APNIC Deaggregation factor: 3.09
Prefixes being announced from the APNIC address blocks: 96298
Unique aggregates announced from the APNIC address blocks: 39859
APNIC Region origin ASes present in the Internet Routing Table: 4691
APNIC Prefixes per ASN: 20.53
APNIC Region origin ASes announcing only one prefix: 1242
APNIC Region transit ASes present in the Internet Routing Table: 736
Average APNIC Region AS path length visible: 4.7
Max APNIC Region AS path length visible: 20
Number of APNIC region 32-bit ASNs visible in the Routing Table: 191
Number of APNIC addresses announced to Internet: 644115808
Equivalent to 38 /8s, 100 /16s and 109 /24s
Percentage of available APNIC address space announced: 81.7

APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 131072-132095, 132096-133119
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 175/8, 180/8,
182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8,
219/8, 220/8, 221/8, 222/8, 223/8,

ARIN Region Analysis Summary
----------------------------

Prefixes being announced by ARIN Region ASes: 151172
Total ARIN prefixes after maximum aggregation: 76447
ARIN Deaggregation factor: 1.98
Prefixes being announced from the ARIN address blocks: 122239
Unique aggregates announced from the ARIN address blocks: 50389
ARIN Region origin ASes present in the Internet Routing Table: 15052
ARIN Prefixes per ASN: 8.12
ARIN Region origin ASes announcing only one prefix: 5720
ARIN Region transit ASes present in the Internet Routing Table: 1587
Average ARIN Region AS path length visible: 4.0
Max ARIN Region AS path length visible: 29
Number of ARIN region 32-bit ASNs visible in the Routing Table: 17
Number of ARIN addresses announced to Internet: 807328448
Equivalent to 48 /8s, 30 /16s and 218 /24s
Percentage of available ARIN address space announced: 64.4

ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 393216-394239
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
53/8, 54/8, 55/8, 56/8, 57/8, 63/8, 64/8,
65/8, 66/8, 67/8, 68/8, 69/8, 70/8, 71/8,
72/8, 73/8, 74/8, 75/8, 76/8, 96/8, 97/8,
98/8, 99/8, 100/8, 104/8, 107/8, 108/8, 173/8,
174/8, 184/8, 199/8, 204/8, 205/8, 206/8, 207/8,
208/8, 209/8, 214/8, 215/8, 216/8,

RIPE Region Analysis Summary
----------------------------

Prefixes being announced by RIPE Region ASes: 101912
Total RIPE prefixes after maximum aggregation: 53843
RIPE Deaggregation factor: 1.89
Prefixes being announced from the RIPE address blocks: 93826
Unique aggregates announced from the RIPE address blocks: 58376
RIPE Region origin ASes present in the Internet Routing Table: 16520
RIPE Prefixes per ASN: 5.68
RIPE Region origin ASes announcing only one prefix: 8044
RIPE Region transit ASes present in the Internet Routing Table: 2628
Average RIPE Region AS path length visible: 5.0
Max RIPE Region AS path length visible: 28
Number of RIPE region 32-bit ASNs visible in the Routing Table: 1520
Number of RIPE addresses announced to Internet: 510902280
Equivalent to 30 /8s, 115 /16s and 192 /24s
Percentage of available RIPE address space announced: 82.3

RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
196608-198655
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8,
83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8,
90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8,
176/8, 178/8, 185/8, 193/8, 194/8, 195/8, 212/8,
213/8, 217/8,

LACNIC Region Analysis Summary
------------------------------

Prefixes being announced by LACNIC Region ASes: 40770
Total LACNIC prefixes after maximum aggregation: 8260
LACNIC Deaggregation factor: 4.94
Prefixes being announced from the LACNIC address blocks: 40640
Unique aggregates announced from the LACNIC address blocks: 20230
LACNIC Region origin ASes present in the Internet Routing Table: 1590
LACNIC Prefixes per ASN: 25.56
LACNIC Region origin ASes announcing only one prefix: 440
LACNIC Region transit ASes present in the Internet Routing Table: 299
Average LACNIC Region AS path length visible: 4.5
Max LACNIC Region AS path length visible: 21
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 531
Number of LACNIC addresses announced to Internet: 99464584
Equivalent to 5 /8s, 237 /16s and 181 /24s
Percentage of available LACNIC address space announced: 65.9

LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
262144-263167 plus ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
200/8, 201/8,

AfriNIC Region Analysis Summary
-------------------------------

Prefixes being announced by AfriNIC Region ASes: 8643
Total AfriNIC prefixes after maximum aggregation: 2136
AfriNIC Deaggregation factor: 4.05
Prefixes being announced from the AfriNIC address blocks: 6689
Unique aggregates announced from the AfriNIC address blocks: 2218
AfriNIC Region origin ASes present in the Internet Routing Table: 530
AfriNIC Prefixes per ASN: 12.62
AfriNIC Region origin ASes announcing only one prefix: 169
AfriNIC Region transit ASes present in the Internet Routing Table: 119
Average AfriNIC Region AS path length visible: 4.6
Max AfriNIC Region AS path length visible: 25
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 5
Number of AfriNIC addresses announced to Internet: 31251200
Equivalent to 1 /8s, 220 /16s and 219 /24s
Percentage of available AfriNIC address space announced: 46.6

AfriNIC AS Blocks 36864-37887, 327680-328703 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 197/8,

APNIC Region per AS prefix count summary
----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
4766 2491 11112 1009 Korea Telecom (KIX)
17974 1822 509 71 PT TELEKOMUNIKASI INDONESIA
7545 1679 301 88 TPG Internet Pty Ltd
4755 1591 387 166 TATA Communications formerly
9829 1260 1069 30 BSNL National Internet Backbo
7552 1169 1062 11 Vietel Corporation
9583 1145 84 490 Sify Limited
4808 1113 2050 319 CNCGROUP IP network: China169
24560 1027 385 167 Bharti Airtel Ltd., Telemedia
9498 951 291 64 BHARTI Airtel Ltd.

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-APNIC

ARIN Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3424 3807 198 bellsouth.net, inc.
7029 3368 986 158 Windstream Communications Inc
18566 2091 382 179 Covad Communications
1785 1906 680 131 PaeTec Communications, Inc.
20115 1639 1566 619 Charter Communications
4323 1600 1044 383 Time Warner Telecom
22773 1580 2910 114 Cox Communications, Inc.
30036 1419 261 768 Mediacom Communications Corp
7018 1249 9774 818 AT&T WorldNet Services
11492 1186 216 364 Cable One

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-ARIN

RIPE Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
8402 1762 544 16 Corbina telecom
2118 1304 97 14 EUnet/RELCOM Autonomous Syste
31148 681 37 9 FreeNet ISP
34984 680 188 173 BILISIM TELEKOM
6830 655 2215 426 UPC Distribution Services
12479 645 666 62 Uni2 Autonomous System
20940 639 206 496 Akamai Technologies European
8551 571 360 80 Bezeq International
3320 531 8441 397 Deutsche Telekom AG
2578 501 33 7 Demos, Moscow, Russia

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-RIPE

LACNIC Region per AS prefix count summary
-----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
10620 1805 328 181 TVCABLE BOGOTA
28573 1794 1111 62 NET Servicos de Comunicao S.A
6503 1533 418 65 AVANTEL, S.A.
8151 1483 3000 342 UniNet S.A. de C.V.
7303 1362 829 187 Telecom Argentina Stet-France
26615 902 697 32 Tim Brasil S.A.
27947 684 74 98 Telconet S.A
11172 639 91 73 Servicios Alestra S.A de C.V
22047 582 326 15 VTR PUNTO NET S.A.
3816 572 242 100 Empresa Nacional de Telecomun

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-LACNIC

AfriNIC Region per AS prefix count summary
------------------------------------------

ASN No of nets /20 equiv MaxAgg Description
8452 1167 958 13 TEDATA
24863 840 274 35 LINKdotNET AS number
6713 493 649 18 Itissalat Al-MAGHRIB
3741 265 921 223 The Internet Solution
12258 197 28 62 Vodacom Internet Company
33776 197 12 21 Starcomms Nigeria Limited
24835 179 80 8 RAYA Telecom - Egypt
16637 174 666 83 MTN Network Solutions
15706 169 32 6 Sudatel Internet Exchange Aut
29571 157 15 16 Ci Telecom Autonomous system

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-AFRINIC

Global Per AS prefix count summary
----------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3424 3807 198 bellsouth.net, inc.
7029 3368 986 158 Windstream Communications Inc
4766 2491 11112 1009 Korea Telecom (KIX)
18566 2091 382 179 Covad Communications
1785 1906 680 131 PaeTec Communications, Inc.
17974 1822 509 71 PT TELEKOMUNIKASI INDONESIA
10620 1805 328 181 TVCABLE BOGOTA
28573 1794 1111 62 NET Servicos de Comunicao S.A
8402 1762 544 16 Corbina telecom
7545 1679 301 88 TPG Internet Pty Ltd

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet

Global Per AS Maximum Aggr summary
----------------------------------

ASN No of nets Net Savings Description
7029 3368 3210 Windstream Communications Inc
18566 2091 1912 Covad Communications
1785 1906 1775 PaeTec Communications, Inc.
17974 1822 1751 PT TELEKOMUNIKASI INDONESIA
8402 1762 1746 Corbina telecom
28573 1794 1732 NET Servicos de Comunicao S.A
10620 1805 1624 TVCABLE BOGOTA
7545 1679 1591 TPG Internet Pty Ltd
4766 2491 1482 Korea Telecom (KIX)
6503 1533 1468 AVANTEL, S.A.

Complete listing at http://thyme.rand.apnic.net/current/data-CIDRnet

List of Unregistered Origin ASNs (Global)
-----------------------------------------

Bad AS Designation Network Transit AS Description
15132 UNALLOCATED 12.9.150.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.14.170.0/24 4323 Time Warner Telecom
32567 UNALLOCATED 12.25.107.0/24 4323 Time Warner Telecom
25639 UNALLOCATED 12.41.169.0/24 7018 AT&T WorldNet Servic
13317 UNALLOCATED 12.44.10.0/24 7018 AT&T WorldNet Servic
23502 UNALLOCATED 12.44.44.0/24 7018 AT&T WorldNet Servic
17300 UNALLOCATED 12.45.103.0/24 7018 AT&T WorldNet Servic
17300 UNALLOCATED 12.45.110.0/24 701 UUNET Technologies,
16476 UNALLOCATED 12.46.27.0/24 7018 AT&T WorldNet Servic
32873 UNALLOCATED 12.46.100.0/23 10912 InterNAP Network Ser

Complete listing at http://thyme.rand.apnic.net/current/data-badAS

Prefixes from private and non-routed address space (Global)
-----------------------------------------------------------

Prefix Origin AS Description
128.0.0.0/21 12654 RIPE NCC RIS Project
128.0.24.0/24 12654 RIPE NCC RIS Project

Complete listing at http://thyme.rand.apnic.net/current/data-dsua

Advertised Unallocated Addresses
--------------------------------

Network Origin AS Description
5.1.56.0/21 23456 32-bit ASN transition
5.8.184.0/21 29286 Skylogic Italia Autonomous Sy
5.9.0.0/16 24940 Hetzner Online AG RZ-Nuernber
14.192.0.0/22 45464 Room 201, TGU Bldg
14.192.4.0/22 45464 Room 201, TGU Bldg
14.192.8.0/22 45464 Room 201, TGU Bldg
14.192.12.0/22 45464 Room 201, TGU Bldg
14.192.16.0/22 45464 Room 201, TGU Bldg
14.192.20.0/22 45464 Room 201, TGU Bldg
14.192.24.0/22 45464 Room 201, TGU Bldg

Complete listing at http://thyme.rand.apnic.net/current/data-add-IANA

Number of prefixes announced per prefix length (Global)
-------------------------------------------------------

/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:19 /9:12 /10:28 /11:81 /12:235
/13:460 /14:829 /15:1489 /16:12240 /17:6246 /18:10547
/19:20618 /20:29031 /21:30088 /22:40623 /23:38091 /24:213817
/25:1200 /26:1433 /27:784 /28:166 /29:66 /30:17
/31:0 /32:19

Advertised prefixes smaller than registry allocations
-----------------------------------------------------

ASN No of nets Total ann. Description
7029 3026 3368 Windstream Communications Inc
6389 2142 3424 bellsouth.net, inc.
18566 2040 2091 Covad Communications
8402 1740 1762 Corbina telecom
10620 1684 1805 TVCABLE BOGOTA
30036 1363 1419 Mediacom Communications Corp
6503 1291 1533 AVANTEL, S.A.
11492 1149 1186 Cable One
1785 1072 1906 PaeTec Communications, Inc.
7011 1069 1184 Citizens Utilities

Complete listing at http://thyme.rand.apnic.net/current/data-sXXas-nos

Number of /24s announced per /8 block (Global)
----------------------------------------------

1:539 2:763 4:14 6:3 8:406 12:2014
13:1 14:610 15:12 16:3 17:7 20:23
23:168 24:1761 27:1273 31:952 32:57 33:2
34:2 36:8 37:418 38:799 40:120 41:2897
42:134 44:3 46:1484 47:3 49:404 50:536
52:13 54:8 55:9 56:3 57:31 58:962
59:521 60:254 61:1276 62:980 63:1990 64:4259
65:2254 66:4483 67:2139 68:1207 69:3211 70:1224
71:484 72:1842 74:2600 75:494 76:344 77:943
78:1011 79:490 80:1208 81:902 82:668 83:550
84:483 85:1211 86:413 87:929 88:342 89:1640
90:291 91:4770 92:521 93:1379 94:1510 95:1173
96:358 97:315 98:896 99:37 100:7 101:172
103:1030 106:102 107:191 108:236 109:1305 110:762
111:921 112:454 113:600 114:643 115:879 116:926
117:719 118:908 119:1231 120:354 121:806 122:1663
123:1101 124:1372 125:1238 128:547 129:195 130:255
131:626 132:180 133:22 134:242 135:62 136:213
137:177 138:355 139:148 140:492 141:241 142:404
143:401 144:522 145:74 146:501 147:278 148:766
149:306 150:159 151:175 152:464 153:171 154:12
155:400 156:215 157:380 158:176 159:539 160:337
161:262 162:348 163:190 164:580 165:399 166:572
167:468 168:819 169:128 170:860 171:127 172:2
173:1756 174:572 175:436 176:441 177:616 178:1348
180:1193 181:80 182:824 183:289 184:459 185:1
186:2224 187:1056 188:1221 189:1790 190:5518 192:6011
193:5540 194:4655 195:3590 196:1283 197:124 198:3661
199:4539 200:5811 201:1932 202:8523 203:8598 204:4327
205:2494 206:2746 207:2816 208:4088 209:3681 210:2751
211:1478 212:2008 213:1925 214:848 215:104 216:5142
217:1536 218:544 219:339 220:1230 221:558 222:323
223:334

End of report
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